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Finding the Fourth Proportional to 65.60, 90.40 and 47.12

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Solution

The fourth proportional to 65.60, 90.40 and 47.12 is: 64.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.60 : 90.40 = 47.12 : x
  2. Step 2: Convert to fraction form
    65.60/90.40 = 47.12/x
  3. Step 3: Cross multiply
    65.60x = 90.40 × 47.12
  4. Step 4: Simplify right side
    65.60x = 4,259.65
  5. Step 5: Solve for x
    x = 4,259.65/65.60
  6. Step 6: Final answer
    x = 64.93

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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.