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Finding the Fourth Proportional to 645,143.65, 890,354.96 and 354,806.37

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Solution

The fourth proportional to 645,143.65, 890,354.96 and 354,806.37 is: 489,663.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,143.65 : 890,354.96 = 354,806.37 : x
  2. Step 2: Convert to fraction form
    645,143.65/890,354.96 = 354,806.37/x
  3. Step 3: Cross multiply
    645,143.65x = 890,354.96 × 354,806.37
  4. Step 4: Simplify right side
    645,143.65x = 315,903,609,052.19
  5. Step 5: Solve for x
    x = 315,903,609,052.19/645,143.65
  6. Step 6: Final answer
    x = 489,663.98

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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.