Home / 86,561.10-129,841.65-81,312.30

Finding the Fourth Proportional to 86,561.10, 129,841.65 and 81,312.30

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Solution

The fourth proportional to 86,561.10, 129,841.65 and 81,312.30 is: 121,968.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,561.10 : 129,841.65 = 81,312.30 : x
  2. Step 2: Convert to fraction form
    86,561.10/129,841.65 = 81,312.30/x
  3. Step 3: Cross multiply
    86,561.10x = 129,841.65 × 81,312.30
  4. Step 4: Simplify right side
    86,561.10x = 10,557,723,197.30
  5. Step 5: Solve for x
    x = 10,557,723,197.30/86,561.10
  6. Step 6: Final answer
    x = 121,968.45

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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.