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Finding the Fourth Proportional to 86,581.80, 129,807.90 and 47,183.40

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Solution

The fourth proportional to 86,581.80, 129,807.90 and 47,183.40 is: 70,739.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,581.80 : 129,807.90 = 47,183.40 : x
  2. Step 2: Convert to fraction form
    86,581.80/129,807.90 = 47,183.40/x
  3. Step 3: Cross multiply
    86,581.80x = 129,807.90 × 47,183.40
  4. Step 4: Simplify right side
    86,581.80x = 6,124,778,068.86
  5. Step 5: Solve for x
    x = 6,124,778,068.86/86,581.80
  6. Step 6: Final answer
    x = 70,739.79

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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.