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Finding the Fourth Proportional to 1,104.16, 1,658.08 and 987.20

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Solution

The fourth proportional to 1,104.16, 1,658.08 and 987.20 is: 1,482.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,104.16 : 1,658.08 = 987.20 : x
  2. Step 2: Convert to fraction form
    1,104.16/1,658.08 = 987.20/x
  3. Step 3: Cross multiply
    1,104.16x = 1,658.08 × 987.20
  4. Step 4: Simplify right side
    1,104.16x = 1,636,856.58
  5. Step 5: Solve for x
    x = 1,636,856.58/1,104.16
  6. Step 6: Final answer
    x = 1,482.45

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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.