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Finding the Fourth Proportional to 1,187.95, 1,780.71 and 458.04

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Solution

The fourth proportional to 1,187.95, 1,780.71 and 458.04 is: 686.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.95 : 1,780.71 = 458.04 : x
  2. Step 2: Convert to fraction form
    1,187.95/1,780.71 = 458.04/x
  3. Step 3: Cross multiply
    1,187.95x = 1,780.71 × 458.04
  4. Step 4: Simplify right side
    1,187.95x = 815,636.41
  5. Step 5: Solve for x
    x = 815,636.41/1,187.95
  6. Step 6: Final answer
    x = 686.59

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.