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Finding the Fourth Proportional to 687.42, 1,029.93 and 572.61

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Solution

The fourth proportional to 687.42, 1,029.93 and 572.61 is: 857.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.42 : 1,029.93 = 572.61 : x
  2. Step 2: Convert to fraction form
    687.42/1,029.93 = 572.61/x
  3. Step 3: Cross multiply
    687.42x = 1,029.93 × 572.61
  4. Step 4: Simplify right side
    687.42x = 589,748.22
  5. Step 5: Solve for x
    x = 589,748.22/687.42
  6. Step 6: Final answer
    x = 857.92

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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.