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Finding the Fourth Proportional to 280,000.55, 386,409.78 and 157,514.15

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Solution

The fourth proportional to 280,000.55, 386,409.78 and 157,514.15 is: 217,374.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,000.55 : 386,409.78 = 157,514.15 : x
  2. Step 2: Convert to fraction form
    280,000.55/386,409.78 = 157,514.15/x
  3. Step 3: Cross multiply
    280,000.55x = 386,409.78 × 157,514.15
  4. Step 4: Simplify right side
    280,000.55x = 60,865,006,116.34
  5. Step 5: Solve for x
    x = 60,865,006,116.34/280,000.55
  6. Step 6: Final answer
    x = 217,374.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.