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Finding the Fourth Proportional to 279,117.30, 391,289.10 and 279,117.30

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Solution

The fourth proportional to 279,117.30, 391,289.10 and 279,117.30 is: 391,289.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,117.30 : 391,289.10 = 279,117.30 : x
  2. Step 2: Convert to fraction form
    279,117.30/391,289.10 = 279,117.30/x
  3. Step 3: Cross multiply
    279,117.30x = 391,289.10 × 279,117.30
  4. Step 4: Simplify right side
    279,117.30x = 109,215,557,111.43
  5. Step 5: Solve for x
    x = 109,215,557,111.43/279,117.30
  6. Step 6: Final answer
    x = 391,289.10

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.