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Finding the Fourth Proportional to 86,590.80, 129,922.65 and 47,176.20

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Solution

The fourth proportional to 86,590.80, 129,922.65 and 47,176.20 is: 70,784.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,590.80 : 129,922.65 = 47,176.20 : x
  2. Step 2: Convert to fraction form
    86,590.80/129,922.65 = 47,176.20/x
  3. Step 3: Cross multiply
    86,590.80x = 129,922.65 × 47,176.20
  4. Step 4: Simplify right side
    86,590.80x = 6,129,256,920.93
  5. Step 5: Solve for x
    x = 6,129,256,920.93/86,590.80
  6. Step 6: Final answer
    x = 70,784.16

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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.