Home / 20,991.81-28,967.58-12,038.88

Finding the Fourth Proportional to 20,991.81, 28,967.58 and 12,038.88

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Solution

The fourth proportional to 20,991.81, 28,967.58 and 12,038.88 is: 16,613.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,991.81 : 28,967.58 = 12,038.88 : x
  2. Step 2: Convert to fraction form
    20,991.81/28,967.58 = 12,038.88/x
  3. Step 3: Cross multiply
    20,991.81x = 28,967.58 × 12,038.88
  4. Step 4: Simplify right side
    20,991.81x = 348,737,219.51
  5. Step 5: Solve for x
    x = 348,737,219.51/20,991.81
  6. Step 6: Final answer
    x = 16,613.01

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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.