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Finding the Fourth Proportional to 85,436.60, 128,154.90 and 81,159.80

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Solution

The fourth proportional to 85,436.60, 128,154.90 and 81,159.80 is: 121,739.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,436.60 : 128,154.90 = 81,159.80 : x
  2. Step 2: Convert to fraction form
    85,436.60/128,154.90 = 81,159.80/x
  3. Step 3: Cross multiply
    85,436.60x = 128,154.90 × 81,159.80
  4. Step 4: Simplify right side
    85,436.60x = 10,401,026,053.02
  5. Step 5: Solve for x
    x = 10,401,026,053.02/85,436.60
  6. Step 6: Final answer
    x = 121,739.70

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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.