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Finding the Fourth Proportional to 415,513.20, 623,269.80 and 257,228.40

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Solution

The fourth proportional to 415,513.20, 623,269.80 and 257,228.40 is: 385,842.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    415,513.20 : 623,269.80 = 257,228.40 : x
  2. Step 2: Convert to fraction form
    415,513.20/623,269.80 = 257,228.40/x
  3. Step 3: Cross multiply
    415,513.20x = 623,269.80 × 257,228.40
  4. Step 4: Simplify right side
    415,513.20x = 160,322,693,422.32
  5. Step 5: Solve for x
    x = 160,322,693,422.32/415,513.20
  6. Step 6: Final answer
    x = 385,842.60

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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.