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Finding the Fourth Proportional to 86,574.40, 129,861.60 and 81,390.40

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Solution

The fourth proportional to 86,574.40, 129,861.60 and 81,390.40 is: 122,085.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,574.40 : 129,861.60 = 81,390.40 : x
  2. Step 2: Convert to fraction form
    86,574.40/129,861.60 = 81,390.40/x
  3. Step 3: Cross multiply
    86,574.40x = 129,861.60 × 81,390.40
  4. Step 4: Simplify right side
    86,574.40x = 10,569,487,568.64
  5. Step 5: Solve for x
    x = 10,569,487,568.64/86,574.40
  6. Step 6: Final answer
    x = 122,085.60

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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.