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Finding the Fourth Proportional to 10,791.90, 14,886.99 and 7,428.78

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Solution

The fourth proportional to 10,791.90, 14,886.99 and 7,428.78 is: 10,247.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,791.90 : 14,886.99 = 7,428.78 : x
  2. Step 2: Convert to fraction form
    10,791.90/14,886.99 = 7,428.78/x
  3. Step 3: Cross multiply
    10,791.90x = 14,886.99 × 7,428.78
  4. Step 4: Simplify right side
    10,791.90x = 110,592,173.57
  5. Step 5: Solve for x
    x = 110,592,173.57/10,791.90
  6. Step 6: Final answer
    x = 10,247.70

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1.5x scale

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.