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Finding the Fourth Proportional to 1,038.17, 1,432.53 and 645.32

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Solution

The fourth proportional to 1,038.17, 1,432.53 and 645.32 is: 890.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.17 : 1,432.53 = 645.32 : x
  2. Step 2: Convert to fraction form
    1,038.17/1,432.53 = 645.32/x
  3. Step 3: Cross multiply
    1,038.17x = 1,432.53 × 645.32
  4. Step 4: Simplify right side
    1,038.17x = 924,440.26
  5. Step 5: Solve for x
    x = 924,440.26/1,038.17
  6. Step 6: Final answer
    x = 890.45

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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.