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Finding the Fourth Proportional to 415,497.20, 623,245.80 and 257,212.40

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Solution

The fourth proportional to 415,497.20, 623,245.80 and 257,212.40 is: 385,818.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    415,497.20 : 623,245.80 = 257,212.40 : x
  2. Step 2: Convert to fraction form
    415,497.20/623,245.80 = 257,212.40/x
  3. Step 3: Cross multiply
    415,497.20x = 623,245.80 × 257,212.40
  4. Step 4: Simplify right side
    415,497.20x = 160,306,548,007.92
  5. Step 5: Solve for x
    x = 160,306,548,007.92/415,497.20
  6. Step 6: Final answer
    x = 385,818.60

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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.