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Finding the Fourth Proportional to 285,520.80, 428,281.20 and 128,056.80

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Solution

The fourth proportional to 285,520.80, 428,281.20 and 128,056.80 is: 192,085.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,520.80 : 428,281.20 = 128,056.80 : x
  2. Step 2: Convert to fraction form
    285,520.80/428,281.20 = 128,056.80/x
  3. Step 3: Cross multiply
    285,520.80x = 428,281.20 × 128,056.80
  4. Step 4: Simplify right side
    285,520.80x = 54,844,319,972.16
  5. Step 5: Solve for x
    x = 54,844,319,972.16/285,520.80
  6. Step 6: Final answer
    x = 192,085.20

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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.