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Finding the Fourth Proportional to 62.78, 86.59 and 45.02

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Solution

The fourth proportional to 62.78, 86.59 and 45.02 is: 62.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    62.78 : 86.59 = 45.02 : x
  2. Step 2: Convert to fraction form
    62.78/86.59 = 45.02/x
  3. Step 3: Cross multiply
    62.78x = 86.59 × 45.02
  4. Step 4: Simplify right side
    62.78x = 3,898.30
  5. Step 5: Solve for x
    x = 3,898.30/62.78
  6. Step 6: Final answer
    x = 62.10

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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.