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Finding the Fourth Proportional to 47.01, 70.09 and 42.19

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Solution

The fourth proportional to 47.01, 70.09 and 42.19 is: 62.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.01 : 70.09 = 42.19 : x
  2. Step 2: Convert to fraction form
    47.01/70.09 = 42.19/x
  3. Step 3: Cross multiply
    47.01x = 70.09 × 42.19
  4. Step 4: Simplify right side
    47.01x = 2,957.10
  5. Step 5: Solve for x
    x = 2,957.10/47.01
  6. Step 6: Final answer
    x = 62.90

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.