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Finding the Fourth Proportional to 1,023.70, 1,543.55 and 987.70

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Solution

The fourth proportional to 1,023.70, 1,543.55 and 987.70 is: 1,489.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,023.70 : 1,543.55 = 987.70 : x
  2. Step 2: Convert to fraction form
    1,023.70/1,543.55 = 987.70/x
  3. Step 3: Cross multiply
    1,023.70x = 1,543.55 × 987.70
  4. Step 4: Simplify right side
    1,023.70x = 1,524,564.34
  5. Step 5: Solve for x
    x = 1,524,564.34/1,023.70
  6. Step 6: Final answer
    x = 1,489.27

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.