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Finding the Fourth Proportional to 85,411.60, 128,117.40 and 80,818.90

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Solution

The fourth proportional to 85,411.60, 128,117.40 and 80,818.90 is: 121,228.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,411.60 : 128,117.40 = 80,818.90 : x
  2. Step 2: Convert to fraction form
    85,411.60/128,117.40 = 80,818.90/x
  3. Step 3: Cross multiply
    85,411.60x = 128,117.40 × 80,818.90
  4. Step 4: Simplify right side
    85,411.60x = 10,354,307,338.86
  5. Step 5: Solve for x
    x = 10,354,307,338.86/85,411.60
  6. Step 6: Final answer
    x = 121,228.35

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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.