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Finding the Fourth Proportional to 612,082.40, 918,123.60 and 521,540.60

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Solution

The fourth proportional to 612,082.40, 918,123.60 and 521,540.60 is: 782,310.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,082.40 : 918,123.60 = 521,540.60 : x
  2. Step 2: Convert to fraction form
    612,082.40/918,123.60 = 521,540.60/x
  3. Step 3: Cross multiply
    612,082.40x = 918,123.60 × 521,540.60
  4. Step 4: Simplify right side
    612,082.40x = 478,838,733,218.16
  5. Step 5: Solve for x
    x = 478,838,733,218.16/612,082.40
  6. Step 6: Final answer
    x = 782,310.90

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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.