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Finding the Fourth Proportional to 753.60, 1,131.12 and 407.10

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Solution

The fourth proportional to 753.60, 1,131.12 and 407.10 is: 611.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.60 : 1,131.12 = 407.10 : x
  2. Step 2: Convert to fraction form
    753.60/1,131.12 = 407.10/x
  3. Step 3: Cross multiply
    753.60x = 1,131.12 × 407.10
  4. Step 4: Simplify right side
    753.60x = 460,478.95
  5. Step 5: Solve for x
    x = 460,478.95/753.60
  6. Step 6: Final answer
    x = 611.04

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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.