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Finding the Fourth Proportional to 415,039.80, 623,142.90 and 257,575.80

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Solution

The fourth proportional to 415,039.80, 623,142.90 and 257,575.80 is: 386,725.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    415,039.80 : 623,142.90 = 257,575.80 : x
  2. Step 2: Convert to fraction form
    415,039.80/623,142.90 = 257,575.80/x
  3. Step 3: Cross multiply
    415,039.80x = 623,142.90 × 257,575.80
  4. Step 4: Simplify right side
    415,039.80x = 160,506,530,981.82
  5. Step 5: Solve for x
    x = 160,506,530,981.82/415,039.80
  6. Step 6: Final answer
    x = 386,725.64

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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.