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Finding the Fourth Proportional to 81,360.84, 112,182.30 and 65,215.20

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Solution

The fourth proportional to 81,360.84, 112,182.30 and 65,215.20 is: 89,920.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,360.84 : 112,182.30 = 65,215.20 : x
  2. Step 2: Convert to fraction form
    81,360.84/112,182.30 = 65,215.20/x
  3. Step 3: Cross multiply
    81,360.84x = 112,182.30 × 65,215.20
  4. Step 4: Simplify right side
    81,360.84x = 7,315,991,130.96
  5. Step 5: Solve for x
    x = 7,315,991,130.96/81,360.84
  6. Step 6: Final answer
    x = 89,920.30

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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.