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Finding the Fourth Proportional to 753.98, 1,129.97 and 407.40

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Solution

The fourth proportional to 753.98, 1,129.97 and 407.40 is: 610.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.98 : 1,129.97 = 407.40 : x
  2. Step 2: Convert to fraction form
    753.98/1,129.97 = 407.40/x
  3. Step 3: Cross multiply
    753.98x = 1,129.97 × 407.40
  4. Step 4: Simplify right side
    753.98x = 460,342.09
  5. Step 5: Solve for x
    x = 460,342.09/753.98
  6. Step 6: Final answer
    x = 610.55

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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.