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Finding the Fourth Proportional to 10,559.80, 15,829.80 and 3,990.40

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Solution

The fourth proportional to 10,559.80, 15,829.80 and 3,990.40 is: 5,981.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,559.80 : 15,829.80 = 3,990.40 : x
  2. Step 2: Convert to fraction form
    10,559.80/15,829.80 = 3,990.40/x
  3. Step 3: Cross multiply
    10,559.80x = 15,829.80 × 3,990.40
  4. Step 4: Simplify right side
    10,559.80x = 63,167,233.92
  5. Step 5: Solve for x
    x = 63,167,233.92/10,559.80
  6. Step 6: Final answer
    x = 5,981.86

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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.