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Finding the Fourth Proportional to 1,085.32, 1,628.24 and 354.90

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Solution

The fourth proportional to 1,085.32, 1,628.24 and 354.90 is: 532.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,085.32 : 1,628.24 = 354.90 : x
  2. Step 2: Convert to fraction form
    1,085.32/1,628.24 = 354.90/x
  3. Step 3: Cross multiply
    1,085.32x = 1,628.24 × 354.90
  4. Step 4: Simplify right side
    1,085.32x = 577,862.38
  5. Step 5: Solve for x
    x = 577,862.38/1,085.32
  6. Step 6: Final answer
    x = 532.44

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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.