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Finding the Fourth Proportional to 15,154.98, 20,918.60 and 12,320.09

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Solution

The fourth proportional to 15,154.98, 20,918.60 and 12,320.09 is: 17,005.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,154.98 : 20,918.60 = 12,320.09 : x
  2. Step 2: Convert to fraction form
    15,154.98/20,918.60 = 12,320.09/x
  3. Step 3: Cross multiply
    15,154.98x = 20,918.60 × 12,320.09
  4. Step 4: Simplify right side
    15,154.98x = 257,718,868.48
  5. Step 5: Solve for x
    x = 257,718,868.48/15,154.98
  6. Step 6: Final answer
    x = 17,005.56

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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.