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Finding the Fourth Proportional to 12,988.87, 17,912.87 and 8,510.99

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Solution

The fourth proportional to 12,988.87, 17,912.87 and 8,510.99 is: 11,737.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,988.87 : 17,912.87 = 8,510.99 : x
  2. Step 2: Convert to fraction form
    12,988.87/17,912.87 = 8,510.99/x
  3. Step 3: Cross multiply
    12,988.87x = 17,912.87 × 8,510.99
  4. Step 4: Simplify right side
    12,988.87x = 152,456,214.89
  5. Step 5: Solve for x
    x = 152,456,214.89/12,988.87
  6. Step 6: Final answer
    x = 11,737.45

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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.