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Finding the Fourth Proportional to 81,186.60, 121,779.90 and 72,730.20

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Solution

The fourth proportional to 81,186.60, 121,779.90 and 72,730.20 is: 109,095.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,186.60 : 121,779.90 = 72,730.20 : x
  2. Step 2: Convert to fraction form
    81,186.60/121,779.90 = 72,730.20/x
  3. Step 3: Cross multiply
    81,186.60x = 121,779.90 × 72,730.20
  4. Step 4: Simplify right side
    81,186.60x = 8,857,076,482.98
  5. Step 5: Solve for x
    x = 8,857,076,482.98/81,186.60
  6. Step 6: Final answer
    x = 109,095.30

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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.