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Finding the Fourth Proportional to 84,838.40, 127,257.60 and 78,423.20

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Solution

The fourth proportional to 84,838.40, 127,257.60 and 78,423.20 is: 117,634.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,838.40 : 127,257.60 = 78,423.20 : x
  2. Step 2: Convert to fraction form
    84,838.40/127,257.60 = 78,423.20/x
  3. Step 3: Cross multiply
    84,838.40x = 127,257.60 × 78,423.20
  4. Step 4: Simplify right side
    84,838.40x = 9,979,948,216.32
  5. Step 5: Solve for x
    x = 9,979,948,216.32/84,838.40
  6. Step 6: Final answer
    x = 117,634.80

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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.