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Finding the Fourth Proportional to 42,711.80, 64,067.70 and 40,670.60

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Solution

The fourth proportional to 42,711.80, 64,067.70 and 40,670.60 is: 61,005.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,711.80 : 64,067.70 = 40,670.60 : x
  2. Step 2: Convert to fraction form
    42,711.80/64,067.70 = 40,670.60/x
  3. Step 3: Cross multiply
    42,711.80x = 64,067.70 × 40,670.60
  4. Step 4: Simplify right side
    42,711.80x = 2,605,671,799.62
  5. Step 5: Solve for x
    x = 2,605,671,799.62/42,711.80
  6. Step 6: Final answer
    x = 61,005.90

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1.5x scale

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.