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Finding the Fourth Proportional to 645,145.65, 890,357.72 and 354,808.37

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Solution

The fourth proportional to 645,145.65, 890,357.72 and 354,808.37 is: 489,666.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,145.65 : 890,357.72 = 354,808.37 : x
  2. Step 2: Convert to fraction form
    645,145.65/890,357.72 = 354,808.37/x
  3. Step 3: Cross multiply
    645,145.65x = 890,357.72 × 354,808.37
  4. Step 4: Simplify right side
    645,145.65x = 315,906,371,350.12
  5. Step 5: Solve for x
    x = 315,906,371,350.12/645,145.65
  6. Step 6: Final answer
    x = 489,666.75

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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.