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Finding the Fourth Proportional to 78,422.80, 117,439.80 and 62,870.80

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Solution

The fourth proportional to 78,422.80, 117,439.80 and 62,870.80 is: 94,150.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,422.80 : 117,439.80 = 62,870.80 : x
  2. Step 2: Convert to fraction form
    78,422.80/117,439.80 = 62,870.80/x
  3. Step 3: Cross multiply
    78,422.80x = 117,439.80 × 62,870.80
  4. Step 4: Simplify right side
    78,422.80x = 7,383,534,177.84
  5. Step 5: Solve for x
    x = 7,383,534,177.84/78,422.80
  6. Step 6: Final answer
    x = 94,150.35

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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.