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Finding the Fourth Proportional to 712.80, 1,068.39 and 575.51

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Solution

The fourth proportional to 712.80, 1,068.39 and 575.51 is: 862.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.80 : 1,068.39 = 575.51 : x
  2. Step 2: Convert to fraction form
    712.80/1,068.39 = 575.51/x
  3. Step 3: Cross multiply
    712.80x = 1,068.39 × 575.51
  4. Step 4: Simplify right side
    712.80x = 614,863.79
  5. Step 5: Solve for x
    x = 614,863.79/712.80
  6. Step 6: Final answer
    x = 862.60

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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.