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Finding the Fourth Proportional to 15,011.76, 20,700.64 and 12,894.25

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Solution

The fourth proportional to 15,011.76, 20,700.64 and 12,894.25 is: 17,780.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,011.76 : 20,700.64 = 12,894.25 : x
  2. Step 2: Convert to fraction form
    15,011.76/20,700.64 = 12,894.25/x
  3. Step 3: Cross multiply
    15,011.76x = 20,700.64 × 12,894.25
  4. Step 4: Simplify right side
    15,011.76x = 266,919,227.32
  5. Step 5: Solve for x
    x = 266,919,227.32/15,011.76
  6. Step 6: Final answer
    x = 17,780.68

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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.