Home / 86,411.40-129,617.10-81,490.65

Finding the Fourth Proportional to 86,411.40, 129,617.10 and 81,490.65

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Solution

The fourth proportional to 86,411.40, 129,617.10 and 81,490.65 is: 122,235.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,411.40 : 129,617.10 = 81,490.65 : x
  2. Step 2: Convert to fraction form
    86,411.40/129,617.10 = 81,490.65/x
  3. Step 3: Cross multiply
    86,411.40x = 129,617.10 × 81,490.65
  4. Step 4: Simplify right side
    86,411.40x = 10,562,581,730.12
  5. Step 5: Solve for x
    x = 10,562,581,730.12/86,411.40
  6. Step 6: Final answer
    x = 122,235.98

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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.