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Finding the Fourth Proportional to 711.27, 981.28 and 431.32

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Solution

The fourth proportional to 711.27, 981.28 and 431.32 is: 595.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.27 : 981.28 = 431.32 : x
  2. Step 2: Convert to fraction form
    711.27/981.28 = 431.32/x
  3. Step 3: Cross multiply
    711.27x = 981.28 × 431.32
  4. Step 4: Simplify right side
    711.27x = 423,242.16
  5. Step 5: Solve for x
    x = 423,242.16/711.27
  6. Step 6: Final answer
    x = 595.05

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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.