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Finding the Fourth Proportional to 72,987.60, 109,405.80 and 39,637.20

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Solution

The fourth proportional to 72,987.60, 109,405.80 and 39,637.20 is: 59,414.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,987.60 : 109,405.80 = 39,637.20 : x
  2. Step 2: Convert to fraction form
    72,987.60/109,405.80 = 39,637.20/x
  3. Step 3: Cross multiply
    72,987.60x = 109,405.80 × 39,637.20
  4. Step 4: Simplify right side
    72,987.60x = 4,336,539,575.76
  5. Step 5: Solve for x
    x = 4,336,539,575.76/72,987.60
  6. Step 6: Final answer
    x = 59,414.74

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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.