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Finding the Fourth Proportional to 86,691.90, 130,075.42 and 30,572.11

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Solution

The fourth proportional to 86,691.90, 130,075.42 and 30,572.11 is: 45,871.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,691.90 : 130,075.42 = 30,572.11 : x
  2. Step 2: Convert to fraction form
    86,691.90/130,075.42 = 30,572.11/x
  3. Step 3: Cross multiply
    86,691.90x = 130,075.42 × 30,572.11
  4. Step 4: Simplify right side
    86,691.90x = 3,976,680,048.54
  5. Step 5: Solve for x
    x = 3,976,680,048.54/86,691.90
  6. Step 6: Final answer
    x = 45,871.41

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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.