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Finding the Fourth Proportional to 76,699.65, 115,041.42 and 20,545.56

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Solution

The fourth proportional to 76,699.65, 115,041.42 and 20,545.56 is: 30,816.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,699.65 : 115,041.42 = 20,545.56 : x
  2. Step 2: Convert to fraction form
    76,699.65/115,041.42 = 20,545.56/x
  3. Step 3: Cross multiply
    76,699.65x = 115,041.42 × 20,545.56
  4. Step 4: Simplify right side
    76,699.65x = 2,363,590,397.10
  5. Step 5: Solve for x
    x = 2,363,590,397.10/76,699.65
  6. Step 6: Final answer
    x = 30,816.18

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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.