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Finding the Fourth Proportional to 1,118.52, 1,543.02 and 869.40

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Solution

The fourth proportional to 1,118.52, 1,543.02 and 869.40 is: 1,199.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.52 : 1,543.02 = 869.40 : x
  2. Step 2: Convert to fraction form
    1,118.52/1,543.02 = 869.40/x
  3. Step 3: Cross multiply
    1,118.52x = 1,543.02 × 869.40
  4. Step 4: Simplify right side
    1,118.52x = 1,341,501.59
  5. Step 5: Solve for x
    x = 1,341,501.59/1,118.52
  6. Step 6: Final answer
    x = 1,199.35

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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.