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Finding the Fourth Proportional to 285,612.60, 428,418.90 and 272,095.80

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Solution

The fourth proportional to 285,612.60, 428,418.90 and 272,095.80 is: 408,143.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,612.60 : 428,418.90 = 272,095.80 : x
  2. Step 2: Convert to fraction form
    285,612.60/428,418.90 = 272,095.80/x
  3. Step 3: Cross multiply
    285,612.60x = 428,418.90 × 272,095.80
  4. Step 4: Simplify right side
    285,612.60x = 116,570,983,330.62
  5. Step 5: Solve for x
    x = 116,570,983,330.62/285,612.60
  6. Step 6: Final answer
    x = 408,143.70

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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.