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Finding the Fourth Proportional to 85,807.20, 128,710.80 and 72,717.60

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Solution

The fourth proportional to 85,807.20, 128,710.80 and 72,717.60 is: 109,076.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,807.20 : 128,710.80 = 72,717.60 : x
  2. Step 2: Convert to fraction form
    85,807.20/128,710.80 = 72,717.60/x
  3. Step 3: Cross multiply
    85,807.20x = 128,710.80 × 72,717.60
  4. Step 4: Simplify right side
    85,807.20x = 9,359,540,470.08
  5. Step 5: Solve for x
    x = 9,359,540,470.08/85,807.20
  6. Step 6: Final answer
    x = 109,076.40

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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.