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Finding the Fourth Proportional to 1,038.42, 1,432.68 and 639.68

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Solution

The fourth proportional to 1,038.42, 1,432.68 and 639.68 is: 882.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.42 : 1,432.68 = 639.68 : x
  2. Step 2: Convert to fraction form
    1,038.42/1,432.68 = 639.68/x
  3. Step 3: Cross multiply
    1,038.42x = 1,432.68 × 639.68
  4. Step 4: Simplify right side
    1,038.42x = 916,449.58
  5. Step 5: Solve for x
    x = 916,449.58/1,038.42
  6. Step 6: Final answer
    x = 882.54

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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.