Home / 81,153.46-122,284.12-66,686.45

Finding the Fourth Proportional to 81,153.46, 122,284.12 and 66,686.45

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Solution

The fourth proportional to 81,153.46, 122,284.12 and 66,686.45 is: 100,484.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,153.46 : 122,284.12 = 66,686.45 : x
  2. Step 2: Convert to fraction form
    81,153.46/122,284.12 = 66,686.45/x
  3. Step 3: Cross multiply
    81,153.46x = 122,284.12 × 66,686.45
  4. Step 4: Simplify right side
    81,153.46x = 8,154,693,701.37
  5. Step 5: Solve for x
    x = 8,154,693,701.37/81,153.46
  6. Step 6: Final answer
    x = 100,484.86

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.