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Finding the Fourth Proportional to 68,479.20, 102,718.80 and 57,981.60

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Solution

The fourth proportional to 68,479.20, 102,718.80 and 57,981.60 is: 86,972.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,479.20 : 102,718.80 = 57,981.60 : x
  2. Step 2: Convert to fraction form
    68,479.20/102,718.80 = 57,981.60/x
  3. Step 3: Cross multiply
    68,479.20x = 102,718.80 × 57,981.60
  4. Step 4: Simplify right side
    68,479.20x = 5,955,800,374.08
  5. Step 5: Solve for x
    x = 5,955,800,374.08/68,479.20
  6. Step 6: Final answer
    x = 86,972.40

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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.