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Finding the Fourth Proportional to 391,356.89, 539,833.80 and 258,749.25

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Solution

The fourth proportional to 391,356.89, 539,833.80 and 258,749.25 is: 356,916.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,356.89 : 539,833.80 = 258,749.25 : x
  2. Step 2: Convert to fraction form
    391,356.89/539,833.80 = 258,749.25/x
  3. Step 3: Cross multiply
    391,356.89x = 539,833.80 × 258,749.25
  4. Step 4: Simplify right side
    391,356.89x = 139,681,590,215.86
  5. Step 5: Solve for x
    x = 139,681,590,215.86/391,356.89
  6. Step 6: Final answer
    x = 356,916.14

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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.