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Finding the Fourth Proportional to 51,307.78, 70,806.15 and 28,645.90

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Solution

The fourth proportional to 51,307.78, 70,806.15 and 28,645.90 is: 39,532.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    51,307.78 : 70,806.15 = 28,645.90 : x
  2. Step 2: Convert to fraction form
    51,307.78/70,806.15 = 28,645.90/x
  3. Step 3: Cross multiply
    51,307.78x = 70,806.15 × 28,645.90
  4. Step 4: Simplify right side
    51,307.78x = 2,028,305,892.29
  5. Step 5: Solve for x
    x = 2,028,305,892.29/51,307.78
  6. Step 6: Final answer
    x = 39,532.13

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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.