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Finding the Fourth Proportional to 908.76, 1,253.70 and 711.48

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Solution

The fourth proportional to 908.76, 1,253.70 and 711.48 is: 981.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.76 : 1,253.70 = 711.48 : x
  2. Step 2: Convert to fraction form
    908.76/1,253.70 = 711.48/x
  3. Step 3: Cross multiply
    908.76x = 1,253.70 × 711.48
  4. Step 4: Simplify right side
    908.76x = 891,982.48
  5. Step 5: Solve for x
    x = 891,982.48/908.76
  6. Step 6: Final answer
    x = 981.54

Related Problems

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Half scale
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Double scale
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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.