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Finding the Fourth Proportional to 525,178.40, 786,961.20 and 391,431.20

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Solution

The fourth proportional to 525,178.40, 786,961.20 and 391,431.20 is: 586,545.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    525,178.40 : 786,961.20 = 391,431.20 : x
  2. Step 2: Convert to fraction form
    525,178.40/786,961.20 = 391,431.20/x
  3. Step 3: Cross multiply
    525,178.40x = 786,961.20 × 391,431.20
  4. Step 4: Simplify right side
    525,178.40x = 308,041,166,869.44
  5. Step 5: Solve for x
    x = 308,041,166,869.44/525,178.40
  6. Step 6: Final answer
    x = 586,545.77

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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.