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Finding the Fourth Proportional to 1,001.23, 1,381.80 and 628.50

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Solution

The fourth proportional to 1,001.23, 1,381.80 and 628.50 is: 867.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,001.23 : 1,381.80 = 628.50 : x
  2. Step 2: Convert to fraction form
    1,001.23/1,381.80 = 628.50/x
  3. Step 3: Cross multiply
    1,001.23x = 1,381.80 × 628.50
  4. Step 4: Simplify right side
    1,001.23x = 868,461.30
  5. Step 5: Solve for x
    x = 868,461.30/1,001.23
  6. Step 6: Final answer
    x = 867.39

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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.