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Finding the Fourth Proportional to 611,817.78, 918,286.97 and 312,508.20

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Solution

The fourth proportional to 611,817.78, 918,286.97 and 312,508.20 is: 469,048.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,817.78 : 918,286.97 = 312,508.20 : x
  2. Step 2: Convert to fraction form
    611,817.78/918,286.97 = 312,508.20/x
  3. Step 3: Cross multiply
    611,817.78x = 918,286.97 × 312,508.20
  4. Step 4: Simplify right side
    611,817.78x = 286,972,206,515.61
  5. Step 5: Solve for x
    x = 286,972,206,515.61/611,817.78
  6. Step 6: Final answer
    x = 469,048.49

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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.