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Finding the Fourth Proportional to 78,349.56, 108,122.20 and 42,539.20

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Solution

The fourth proportional to 78,349.56, 108,122.20 and 42,539.20 is: 58,703.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,349.56 : 108,122.20 = 42,539.20 : x
  2. Step 2: Convert to fraction form
    78,349.56/108,122.20 = 42,539.20/x
  3. Step 3: Cross multiply
    78,349.56x = 108,122.20 × 42,539.20
  4. Step 4: Simplify right side
    78,349.56x = 4,599,431,890.24
  5. Step 5: Solve for x
    x = 4,599,431,890.24/78,349.56
  6. Step 6: Final answer
    x = 58,703.99

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1.5x scale

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.