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Finding the Fourth Proportional to 639.90, 953.51 and 598.91

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Solution

The fourth proportional to 639.90, 953.51 and 598.91 is: 892.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.90 : 953.51 = 598.91 : x
  2. Step 2: Convert to fraction form
    639.90/953.51 = 598.91/x
  3. Step 3: Cross multiply
    639.90x = 953.51 × 598.91
  4. Step 4: Simplify right side
    639.90x = 571,058.91
  5. Step 5: Solve for x
    x = 571,058.91/639.90
  6. Step 6: Final answer
    x = 892.42

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.