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Finding the Fourth Proportional to 10,287.70, 15,431.55 and 7,695.70

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Solution

The fourth proportional to 10,287.70, 15,431.55 and 7,695.70 is: 11,543.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,287.70 : 15,431.55 = 7,695.70 : x
  2. Step 2: Convert to fraction form
    10,287.70/15,431.55 = 7,695.70/x
  3. Step 3: Cross multiply
    10,287.70x = 15,431.55 × 7,695.70
  4. Step 4: Simplify right side
    10,287.70x = 118,756,579.34
  5. Step 5: Solve for x
    x = 118,756,579.34/10,287.70
  6. Step 6: Final answer
    x = 11,543.55

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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.