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Finding the Fourth Proportional to 645,267.70, 890,479.61 and 354,891.88

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Solution

The fourth proportional to 645,267.70, 890,479.61 and 354,891.88 is: 489,756.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,267.70 : 890,479.61 = 354,891.88 : x
  2. Step 2: Convert to fraction form
    645,267.70/890,479.61 = 354,891.88/x
  3. Step 3: Cross multiply
    645,267.70x = 890,479.61 × 354,891.88
  4. Step 4: Simplify right side
    645,267.70x = 316,023,982,894.57
  5. Step 5: Solve for x
    x = 316,023,982,894.57/645,267.70
  6. Step 6: Final answer
    x = 489,756.40

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.