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Finding the Fourth Proportional to 781.50, 1,079.20 and 575.58

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Solution

The fourth proportional to 781.50, 1,079.20 and 575.58 is: 794.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.50 : 1,079.20 = 575.58 : x
  2. Step 2: Convert to fraction form
    781.50/1,079.20 = 575.58/x
  3. Step 3: Cross multiply
    781.50x = 1,079.20 × 575.58
  4. Step 4: Simplify right side
    781.50x = 621,165.94
  5. Step 5: Solve for x
    x = 621,165.94/781.50
  6. Step 6: Final answer
    x = 794.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.