Home / 81,591.48-112,259.04-66,140.28

Finding the Fourth Proportional to 81,591.48, 112,259.04 and 66,140.28

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Solution

The fourth proportional to 81,591.48, 112,259.04 and 66,140.28 is: 91,000.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,591.48 : 112,259.04 = 66,140.28 : x
  2. Step 2: Convert to fraction form
    81,591.48/112,259.04 = 66,140.28/x
  3. Step 3: Cross multiply
    81,591.48x = 112,259.04 × 66,140.28
  4. Step 4: Simplify right side
    81,591.48x = 7,424,844,338.13
  5. Step 5: Solve for x
    x = 7,424,844,338.13/81,591.48
  6. Step 6: Final answer
    x = 91,000.24

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.