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Finding the Fourth Proportional to 12,369.78, 18,510.87 and 7,691.99

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Solution

The fourth proportional to 12,369.78, 18,510.87 and 7,691.99 is: 11,510.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,369.78 : 18,510.87 = 7,691.99 : x
  2. Step 2: Convert to fraction form
    12,369.78/18,510.87 = 7,691.99/x
  3. Step 3: Cross multiply
    12,369.78x = 18,510.87 × 7,691.99
  4. Step 4: Simplify right side
    12,369.78x = 142,385,342.19
  5. Step 5: Solve for x
    x = 142,385,342.19/12,369.78
  6. Step 6: Final answer
    x = 11,510.75

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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.