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Finding the Fourth Proportional to 15,013.50, 20,718.63 and 8,389.50

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Solution

The fourth proportional to 15,013.50, 20,718.63 and 8,389.50 is: 11,577.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,013.50 : 20,718.63 = 8,389.50 : x
  2. Step 2: Convert to fraction form
    15,013.50/20,718.63 = 8,389.50/x
  3. Step 3: Cross multiply
    15,013.50x = 20,718.63 × 8,389.50
  4. Step 4: Simplify right side
    15,013.50x = 173,818,946.39
  5. Step 5: Solve for x
    x = 173,818,946.39/15,013.50
  6. Step 6: Final answer
    x = 11,577.51

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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.