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Finding the Fourth Proportional to 86,642.64, 129,963.96 and 55,674.72

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Solution

The fourth proportional to 86,642.64, 129,963.96 and 55,674.72 is: 83,512.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,642.64 : 129,963.96 = 55,674.72 : x
  2. Step 2: Convert to fraction form
    86,642.64/129,963.96 = 55,674.72/x
  3. Step 3: Cross multiply
    86,642.64x = 129,963.96 × 55,674.72
  4. Step 4: Simplify right side
    86,642.64x = 7,235,707,083.09
  5. Step 5: Solve for x
    x = 7,235,707,083.09/86,642.64
  6. Step 6: Final answer
    x = 83,512.08

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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.