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Finding the Fourth Proportional to 285,438.80, 428,158.20 and 272,316.80

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Solution

The fourth proportional to 285,438.80, 428,158.20 and 272,316.80 is: 408,475.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,438.80 : 428,158.20 = 272,316.80 : x
  2. Step 2: Convert to fraction form
    285,438.80/428,158.20 = 272,316.80/x
  3. Step 3: Cross multiply
    285,438.80x = 428,158.20 × 272,316.80
  4. Step 4: Simplify right side
    285,438.80x = 116,594,670,917.76
  5. Step 5: Solve for x
    x = 116,594,670,917.76/285,438.80
  6. Step 6: Final answer
    x = 408,475.20

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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.