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Finding the Fourth Proportional to 78,349.72, 108,120.54 and 42,539.08

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Solution

The fourth proportional to 78,349.72, 108,120.54 and 42,539.08 is: 58,702.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,349.72 : 108,120.54 = 42,539.08 : x
  2. Step 2: Convert to fraction form
    78,349.72/108,120.54 = 42,539.08/x
  3. Step 3: Cross multiply
    78,349.72x = 108,120.54 × 42,539.08
  4. Step 4: Simplify right side
    78,349.72x = 4,599,348,300.70
  5. Step 5: Solve for x
    x = 4,599,348,300.70/78,349.72
  6. Step 6: Final answer
    x = 58,702.80

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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.