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Finding the Fourth Proportional to 575.32, 861.56 and 428.72

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Solution

The fourth proportional to 575.32, 861.56 and 428.72 is: 642.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    575.32 : 861.56 = 428.72 : x
  2. Step 2: Convert to fraction form
    575.32/861.56 = 428.72/x
  3. Step 3: Cross multiply
    575.32x = 861.56 × 428.72
  4. Step 4: Simplify right side
    575.32x = 369,368.00
  5. Step 5: Solve for x
    x = 369,368.00/575.32
  6. Step 6: Final answer
    x = 642.02

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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.