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Finding the Fourth Proportional to 460,803.20, 691,204.80 and 128,379.20

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Solution

The fourth proportional to 460,803.20, 691,204.80 and 128,379.20 is: 192,568.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    460,803.20 : 691,204.80 = 128,379.20 : x
  2. Step 2: Convert to fraction form
    460,803.20/691,204.80 = 128,379.20/x
  3. Step 3: Cross multiply
    460,803.20x = 691,204.80 × 128,379.20
  4. Step 4: Simplify right side
    460,803.20x = 88,736,319,260.16
  5. Step 5: Solve for x
    x = 88,736,319,260.16/460,803.20
  6. Step 6: Final answer
    x = 192,568.80

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Similar ratio
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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.