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Finding the Fourth Proportional to 80,700.60, 120,905.10 and 69,036.60

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Solution

The fourth proportional to 80,700.60, 120,905.10 and 69,036.60 is: 103,430.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,700.60 : 120,905.10 = 69,036.60 : x
  2. Step 2: Convert to fraction form
    80,700.60/120,905.10 = 69,036.60/x
  3. Step 3: Cross multiply
    80,700.60x = 120,905.10 × 69,036.60
  4. Step 4: Simplify right side
    80,700.60x = 8,346,877,026.66
  5. Step 5: Solve for x
    x = 8,346,877,026.66/80,700.60
  6. Step 6: Final answer
    x = 103,430.17

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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.