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Finding the Fourth Proportional to 708.40, 1,062.81 and 400.46

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Solution

The fourth proportional to 708.40, 1,062.81 and 400.46 is: 600.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.40 : 1,062.81 = 400.46 : x
  2. Step 2: Convert to fraction form
    708.40/1,062.81 = 400.46/x
  3. Step 3: Cross multiply
    708.40x = 1,062.81 × 400.46
  4. Step 4: Simplify right side
    708.40x = 425,615.55
  5. Step 5: Solve for x
    x = 425,615.55/708.40
  6. Step 6: Final answer
    x = 600.81

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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.