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Finding the Fourth Proportional to 85,406.10, 128,109.15 and 81,323.70

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Solution

The fourth proportional to 85,406.10, 128,109.15 and 81,323.70 is: 121,985.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,406.10 : 128,109.15 = 81,323.70 : x
  2. Step 2: Convert to fraction form
    85,406.10/128,109.15 = 81,323.70/x
  3. Step 3: Cross multiply
    85,406.10x = 128,109.15 × 81,323.70
  4. Step 4: Simplify right side
    85,406.10x = 10,418,310,081.86
  5. Step 5: Solve for x
    x = 10,418,310,081.86/85,406.10
  6. Step 6: Final answer
    x = 121,985.55

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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.