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Finding the Fourth Proportional to 1,013.19, 1,397.27 and 639.52

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Solution

The fourth proportional to 1,013.19, 1,397.27 and 639.52 is: 881.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,013.19 : 1,397.27 = 639.52 : x
  2. Step 2: Convert to fraction form
    1,013.19/1,397.27 = 639.52/x
  3. Step 3: Cross multiply
    1,013.19x = 1,397.27 × 639.52
  4. Step 4: Simplify right side
    1,013.19x = 893,582.11
  5. Step 5: Solve for x
    x = 893,582.11/1,013.19
  6. Step 6: Final answer
    x = 881.95

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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.