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Finding the Fourth Proportional to 86,817.60, 129,880.80 and 75,259.20

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Solution

The fourth proportional to 86,817.60, 129,880.80 and 75,259.20 is: 112,589.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,817.60 : 129,880.80 = 75,259.20 : x
  2. Step 2: Convert to fraction form
    86,817.60/129,880.80 = 75,259.20/x
  3. Step 3: Cross multiply
    86,817.60x = 129,880.80 × 75,259.20
  4. Step 4: Simplify right side
    86,817.60x = 9,774,725,103.36
  5. Step 5: Solve for x
    x = 9,774,725,103.36/86,817.60
  6. Step 6: Final answer
    x = 112,589.21

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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.