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Finding the Fourth Proportional to 47.13, 70.58 and 42.00

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Solution

The fourth proportional to 47.13, 70.58 and 42.00 is: 62.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.13 : 70.58 = 42.00 : x
  2. Step 2: Convert to fraction form
    47.13/70.58 = 42.00/x
  3. Step 3: Cross multiply
    47.13x = 70.58 × 42.00
  4. Step 4: Simplify right side
    47.13x = 2,964.20
  5. Step 5: Solve for x
    x = 2,964.20/47.13
  6. Step 6: Final answer
    x = 62.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.