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Finding the Fourth Proportional to 1,038.50, 1,432.74 and 665.43

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Solution

The fourth proportional to 1,038.50, 1,432.74 and 665.43 is: 918.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.50 : 1,432.74 = 665.43 : x
  2. Step 2: Convert to fraction form
    1,038.50/1,432.74 = 665.43/x
  3. Step 3: Cross multiply
    1,038.50x = 1,432.74 × 665.43
  4. Step 4: Simplify right side
    1,038.50x = 953,388.18
  5. Step 5: Solve for x
    x = 953,388.18/1,038.50
  6. Step 6: Final answer
    x = 918.04

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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.