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Finding the Fourth Proportional to 65,716, 90,688.20 and 35,908

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Solution

The fourth proportional to 65,716, 90,688.20 and 35,908 is: 49,553.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,716 : 90,688.20 = 35,908 : x
  2. Step 2: Convert to fraction form
    65,716/90,688.20 = 35,908/x
  3. Step 3: Cross multiply
    65,716x = 90,688.20 × 35,908
  4. Step 4: Simplify right side
    65,716x = 3,256,431,885.60
  5. Step 5: Solve for x
    x = 3,256,431,885.60/65,716
  6. Step 6: Final answer
    x = 49,553.11

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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.