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Finding the Fourth Proportional to 931.00, 1,397.08 and 520.40

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Solution

The fourth proportional to 931.00, 1,397.08 and 520.40 is: 780.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.00 : 1,397.08 = 520.40 : x
  2. Step 2: Convert to fraction form
    931.00/1,397.08 = 520.40/x
  3. Step 3: Cross multiply
    931.00x = 1,397.08 × 520.40
  4. Step 4: Simplify right side
    931.00x = 727,044.95
  5. Step 5: Solve for x
    x = 727,044.95/931.00
  6. Step 6: Final answer
    x = 780.93

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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.