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Finding the Fourth Proportional to 20,987.19, 28,965.03 and 12,037.89

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Solution

The fourth proportional to 20,987.19, 28,965.03 and 12,037.89 is: 16,613.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.19 : 28,965.03 = 12,037.89 : x
  2. Step 2: Convert to fraction form
    20,987.19/28,965.03 = 12,037.89/x
  3. Step 3: Cross multiply
    20,987.19x = 28,965.03 × 12,037.89
  4. Step 4: Simplify right side
    20,987.19x = 348,677,844.99
  5. Step 5: Solve for x
    x = 348,677,844.99/20,987.19
  6. Step 6: Final answer
    x = 16,613.84

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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.