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Finding the Fourth Proportional to 286,938.40, 430,407.60 and 207,680.80

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Solution

The fourth proportional to 286,938.40, 430,407.60 and 207,680.80 is: 311,521.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    286,938.40 : 430,407.60 = 207,680.80 : x
  2. Step 2: Convert to fraction form
    286,938.40/430,407.60 = 207,680.80/x
  3. Step 3: Cross multiply
    286,938.40x = 430,407.60 × 207,680.80
  4. Step 4: Simplify right side
    286,938.40x = 89,387,394,694.08
  5. Step 5: Solve for x
    x = 89,387,394,694.08/286,938.40
  6. Step 6: Final answer
    x = 311,521.20

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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.