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Finding the Fourth Proportional to 644,125.80, 966,188.70 and 407,735.40

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Solution

The fourth proportional to 644,125.80, 966,188.70 and 407,735.40 is: 611,603.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,125.80 : 966,188.70 = 407,735.40 : x
  2. Step 2: Convert to fraction form
    644,125.80/966,188.70 = 407,735.40/x
  3. Step 3: Cross multiply
    644,125.80x = 966,188.70 × 407,735.40
  4. Step 4: Simplify right side
    644,125.80x = 393,949,336,069.98
  5. Step 5: Solve for x
    x = 393,949,336,069.98/644,125.80
  6. Step 6: Final answer
    x = 611,603.10

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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.