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Finding the Fourth Proportional to 82,430.60, 123,718.80 and 70,620.80

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Solution

The fourth proportional to 82,430.60, 123,718.80 and 70,620.80 is: 105,993.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    82,430.60 : 123,718.80 = 70,620.80 : x
  2. Step 2: Convert to fraction form
    82,430.60/123,718.80 = 70,620.80/x
  3. Step 3: Cross multiply
    82,430.60x = 123,718.80 × 70,620.80
  4. Step 4: Simplify right side
    82,430.60x = 8,737,120,631.04
  5. Step 5: Solve for x
    x = 8,737,120,631.04/82,430.60
  6. Step 6: Final answer
    x = 105,993.66

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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.