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Finding the Fourth Proportional to 56.61, 85.33 and 52.90

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Solution

The fourth proportional to 56.61, 85.33 and 52.90 is: 79.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.61 : 85.33 = 52.90 : x
  2. Step 2: Convert to fraction form
    56.61/85.33 = 52.90/x
  3. Step 3: Cross multiply
    56.61x = 85.33 × 52.90
  4. Step 4: Simplify right side
    56.61x = 4,513.96
  5. Step 5: Solve for x
    x = 4,513.96/56.61
  6. Step 6: Final answer
    x = 79.74

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.