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Finding the Fourth Proportional to 1,330.59, 1,836.17 and 771.11

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Solution

The fourth proportional to 1,330.59, 1,836.17 and 771.11 is: 1,064.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,330.59 : 1,836.17 = 771.11 : x
  2. Step 2: Convert to fraction form
    1,330.59/1,836.17 = 771.11/x
  3. Step 3: Cross multiply
    1,330.59x = 1,836.17 × 771.11
  4. Step 4: Simplify right side
    1,330.59x = 1,415,879.87
  5. Step 5: Solve for x
    x = 1,415,879.87/1,330.59
  6. Step 6: Final answer
    x = 1,064.10

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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.