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Finding the Fourth Proportional to 85,801.20, 128,701.80 and 72,711.60

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Solution

The fourth proportional to 85,801.20, 128,701.80 and 72,711.60 is: 109,067.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,801.20 : 128,701.80 = 72,711.60 : x
  2. Step 2: Convert to fraction form
    85,801.20/128,701.80 = 72,711.60/x
  3. Step 3: Cross multiply
    85,801.20x = 128,701.80 × 72,711.60
  4. Step 4: Simplify right side
    85,801.20x = 9,358,113,800.88
  5. Step 5: Solve for x
    x = 9,358,113,800.88/85,801.20
  6. Step 6: Final answer
    x = 109,067.40

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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.