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Finding the Fourth Proportional to 287,568.90, 431,353.35 and 217,584.90

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Solution

The fourth proportional to 287,568.90, 431,353.35 and 217,584.90 is: 326,377.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,568.90 : 431,353.35 = 217,584.90 : x
  2. Step 2: Convert to fraction form
    287,568.90/431,353.35 = 217,584.90/x
  3. Step 3: Cross multiply
    287,568.90x = 431,353.35 × 217,584.90
  4. Step 4: Simplify right side
    287,568.90x = 93,855,975,524.42
  5. Step 5: Solve for x
    x = 93,855,975,524.42/287,568.90
  6. Step 6: Final answer
    x = 326,377.35

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1.5x scale

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.