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Finding the Fourth Proportional to 1,113.47, 1,669.72 and 372.88

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Solution

The fourth proportional to 1,113.47, 1,669.72 and 372.88 is: 559.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,113.47 : 1,669.72 = 372.88 : x
  2. Step 2: Convert to fraction form
    1,113.47/1,669.72 = 372.88/x
  3. Step 3: Cross multiply
    1,113.47x = 1,669.72 × 372.88
  4. Step 4: Simplify right side
    1,113.47x = 622,605.19
  5. Step 5: Solve for x
    x = 622,605.19/1,113.47
  6. Step 6: Final answer
    x = 559.16

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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.