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Finding the Fourth Proportional to 438,911.40, 605,781.70 and 257,663.40

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Solution

The fourth proportional to 438,911.40, 605,781.70 and 257,663.40 is: 355,624.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,911.40 : 605,781.70 = 257,663.40 : x
  2. Step 2: Convert to fraction form
    438,911.40/605,781.70 = 257,663.40/x
  3. Step 3: Cross multiply
    438,911.40x = 605,781.70 × 257,663.40
  4. Step 4: Simplify right side
    438,911.40x = 156,087,772,479.78
  5. Step 5: Solve for x
    x = 156,087,772,479.78/438,911.40
  6. Step 6: Final answer
    x = 355,624.79

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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.