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Finding the Fourth Proportional to 1,330.86, 1,836.78 and 998.76

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Solution

The fourth proportional to 1,330.86, 1,836.78 and 998.76 is: 1,378.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,330.86 : 1,836.78 = 998.76 : x
  2. Step 2: Convert to fraction form
    1,330.86/1,836.78 = 998.76/x
  3. Step 3: Cross multiply
    1,330.86x = 1,836.78 × 998.76
  4. Step 4: Simplify right side
    1,330.86x = 1,834,502.39
  5. Step 5: Solve for x
    x = 1,834,502.39/1,330.86
  6. Step 6: Final answer
    x = 1,378.43

Related Problems

Find fourth proportional to 665.43, 918.39 and 499.38
Half scale
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Double scale
Find fourth proportional to 1,331.86, 1,838.16 and 999.76
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.