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Finding the Fourth Proportional to 86,821.80, 130,232.70 and 71,075.40

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Solution

The fourth proportional to 86,821.80, 130,232.70 and 71,075.40 is: 106,613.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,821.80 : 130,232.70 = 71,075.40 : x
  2. Step 2: Convert to fraction form
    86,821.80/130,232.70 = 71,075.40/x
  3. Step 3: Cross multiply
    86,821.80x = 130,232.70 × 71,075.40
  4. Step 4: Simplify right side
    86,821.80x = 9,256,341,245.58
  5. Step 5: Solve for x
    x = 9,256,341,245.58/86,821.80
  6. Step 6: Final answer
    x = 106,613.10

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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.