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Finding the Fourth Proportional to 931.96, 1,397.76 and 431.51

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Solution

The fourth proportional to 931.96, 1,397.76 and 431.51 is: 647.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.96 : 1,397.76 = 431.51 : x
  2. Step 2: Convert to fraction form
    931.96/1,397.76 = 431.51/x
  3. Step 3: Cross multiply
    931.96x = 1,397.76 × 431.51
  4. Step 4: Simplify right side
    931.96x = 603,147.42
  5. Step 5: Solve for x
    x = 603,147.42/931.96
  6. Step 6: Final answer
    x = 647.19

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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.