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Finding the Fourth Proportional to 86,619, 129,708.18 and 78,631.32

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Solution

The fourth proportional to 86,619, 129,708.18 and 78,631.32 is: 117,746.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,619 : 129,708.18 = 78,631.32 : x
  2. Step 2: Convert to fraction form
    86,619/129,708.18 = 78,631.32/x
  3. Step 3: Cross multiply
    86,619x = 129,708.18 × 78,631.32
  4. Step 4: Simplify right side
    86,619x = 10,199,125,408.20
  5. Step 5: Solve for x
    x = 10,199,125,408.20/86,619
  6. Step 6: Final answer
    x = 117,746.98

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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.