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Finding the Fourth Proportional to 86,611.60, 129,917.40 and 74,947.60

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Solution

The fourth proportional to 86,611.60, 129,917.40 and 74,947.60 is: 112,421.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,611.60 : 129,917.40 = 74,947.60 : x
  2. Step 2: Convert to fraction form
    86,611.60/129,917.40 = 74,947.60/x
  3. Step 3: Cross multiply
    86,611.60x = 129,917.40 × 74,947.60
  4. Step 4: Simplify right side
    86,611.60x = 9,736,997,328.24
  5. Step 5: Solve for x
    x = 9,736,997,328.24/86,611.60
  6. Step 6: Final answer
    x = 112,421.40

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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.