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Finding the Fourth Proportional to 1,032.85, 1,425.47 and 639.93

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Solution

The fourth proportional to 1,032.85, 1,425.47 and 639.93 is: 883.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,032.85 : 1,425.47 = 639.93 : x
  2. Step 2: Convert to fraction form
    1,032.85/1,425.47 = 639.93/x
  3. Step 3: Cross multiply
    1,032.85x = 1,425.47 × 639.93
  4. Step 4: Simplify right side
    1,032.85x = 912,203.16
  5. Step 5: Solve for x
    x = 912,203.16/1,032.85
  6. Step 6: Final answer
    x = 883.19

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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.