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Finding the Fourth Proportional to 78,349.90, 108,122.52 and 42,539.62

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Solution

The fourth proportional to 78,349.90, 108,122.52 and 42,539.62 is: 58,704.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,349.90 : 108,122.52 = 42,539.62 : x
  2. Step 2: Convert to fraction form
    78,349.90/108,122.52 = 42,539.62/x
  3. Step 3: Cross multiply
    78,349.90x = 108,122.52 × 42,539.62
  4. Step 4: Simplify right side
    78,349.90x = 4,599,490,914.24
  5. Step 5: Solve for x
    x = 4,599,490,914.24/78,349.90
  6. Step 6: Final answer
    x = 58,704.49

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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.