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Finding the Fourth Proportional to 645,174.43, 890,363.61 and 354,808.07

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Solution

The fourth proportional to 645,174.43, 890,363.61 and 354,808.07 is: 489,647.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,174.43 : 890,363.61 = 354,808.07 : x
  2. Step 2: Convert to fraction form
    645,174.43/890,363.61 = 354,808.07/x
  3. Step 3: Cross multiply
    645,174.43x = 890,363.61 × 354,808.07
  4. Step 4: Simplify right side
    645,174.43x = 315,908,187,836.47
  5. Step 5: Solve for x
    x = 315,908,187,836.47/645,174.43
  6. Step 6: Final answer
    x = 489,647.72

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1.5x scale

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.