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Finding the Fourth Proportional to 611,872.40, 917,808.60 and 521,330.60

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Solution

The fourth proportional to 611,872.40, 917,808.60 and 521,330.60 is: 781,995.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,872.40 : 917,808.60 = 521,330.60 : x
  2. Step 2: Convert to fraction form
    611,872.40/917,808.60 = 521,330.60/x
  3. Step 3: Cross multiply
    611,872.40x = 917,808.60 × 521,330.60
  4. Step 4: Simplify right side
    611,872.40x = 478,481,708,123.16
  5. Step 5: Solve for x
    x = 478,481,708,123.16/611,872.40
  6. Step 6: Final answer
    x = 781,995.90

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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.