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Finding the Fourth Proportional to 86,643.64, 129,965.46 and 55,675.72

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Solution

The fourth proportional to 86,643.64, 129,965.46 and 55,675.72 is: 83,513.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,643.64 : 129,965.46 = 55,675.72 : x
  2. Step 2: Convert to fraction form
    86,643.64/129,965.46 = 55,675.72/x
  3. Step 3: Cross multiply
    86,643.64x = 129,965.46 × 55,675.72
  4. Step 4: Simplify right side
    86,643.64x = 7,235,920,560.63
  5. Step 5: Solve for x
    x = 7,235,920,560.63/86,643.64
  6. Step 6: Final answer
    x = 83,513.58

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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.