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Finding the Fourth Proportional to 75,420.70, 113,036.72 and 37,990.20

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Solution

The fourth proportional to 75,420.70, 113,036.72 and 37,990.20 is: 56,937.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    75,420.70 : 113,036.72 = 37,990.20 : x
  2. Step 2: Convert to fraction form
    75,420.70/113,036.72 = 37,990.20/x
  3. Step 3: Cross multiply
    75,420.70x = 113,036.72 × 37,990.20
  4. Step 4: Simplify right side
    75,420.70x = 4,294,287,600.14
  5. Step 5: Solve for x
    x = 4,294,287,600.14/75,420.70
  6. Step 6: Final answer
    x = 56,937.78

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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.