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Finding the Fourth Proportional to 62.10, 85.72 and 40.30

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Solution

The fourth proportional to 62.10, 85.72 and 40.30 is: 55.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    62.10 : 85.72 = 40.30 : x
  2. Step 2: Convert to fraction form
    62.10/85.72 = 40.30/x
  3. Step 3: Cross multiply
    62.10x = 85.72 × 40.30
  4. Step 4: Simplify right side
    62.10x = 3,454.52
  5. Step 5: Solve for x
    x = 3,454.52/62.10
  6. Step 6: Final answer
    x = 55.63

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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.