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Finding the Fourth Proportional to 931.68, 1,397.58 and 520.50

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Solution

The fourth proportional to 931.68, 1,397.58 and 520.50 is: 780.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.68 : 1,397.58 = 520.50 : x
  2. Step 2: Convert to fraction form
    931.68/1,397.58 = 520.50/x
  3. Step 3: Cross multiply
    931.68x = 1,397.58 × 520.50
  4. Step 4: Simplify right side
    931.68x = 727,440.39
  5. Step 5: Solve for x
    x = 727,440.39/931.68
  6. Step 6: Final answer
    x = 780.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.