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Finding the Fourth Proportional to 1,121.92, 1,681.50 and 847.15

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Solution

The fourth proportional to 1,121.92, 1,681.50 and 847.15 is: 1,269.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.92 : 1,681.50 = 847.15 : x
  2. Step 2: Convert to fraction form
    1,121.92/1,681.50 = 847.15/x
  3. Step 3: Cross multiply
    1,121.92x = 1,681.50 × 847.15
  4. Step 4: Simplify right side
    1,121.92x = 1,424,482.73
  5. Step 5: Solve for x
    x = 1,424,482.73/1,121.92
  6. Step 6: Final answer
    x = 1,269.68

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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.