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Finding the Fourth Proportional to 65.60, 90.42 and 47.15

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Solution

The fourth proportional to 65.60, 90.42 and 47.15 is: 64.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.60 : 90.42 = 47.15 : x
  2. Step 2: Convert to fraction form
    65.60/90.42 = 47.15/x
  3. Step 3: Cross multiply
    65.60x = 90.42 × 47.15
  4. Step 4: Simplify right side
    65.60x = 4,263.30
  5. Step 5: Solve for x
    x = 4,263.30/65.60
  6. Step 6: Final answer
    x = 64.99

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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.