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Finding the Fourth Proportional to 931.38, 1,395.84 and 411.51

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Solution

The fourth proportional to 931.38, 1,395.84 and 411.51 is: 616.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.38 : 1,395.84 = 411.51 : x
  2. Step 2: Convert to fraction form
    931.38/1,395.84 = 411.51/x
  3. Step 3: Cross multiply
    931.38x = 1,395.84 × 411.51
  4. Step 4: Simplify right side
    931.38x = 574,402.12
  5. Step 5: Solve for x
    x = 574,402.12/931.38
  6. Step 6: Final answer
    x = 616.72

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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.