Home / 18,991.12-28,486.80-12,458.72

Finding the Fourth Proportional to 18,991.12, 28,486.80 and 12,458.72

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Solution

The fourth proportional to 18,991.12, 28,486.80 and 12,458.72 is: 18,688.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,991.12 : 28,486.80 = 12,458.72 : x
  2. Step 2: Convert to fraction form
    18,991.12/28,486.80 = 12,458.72/x
  3. Step 3: Cross multiply
    18,991.12x = 28,486.80 × 12,458.72
  4. Step 4: Simplify right side
    18,991.12x = 354,909,064.90
  5. Step 5: Solve for x
    x = 354,909,064.90/18,991.12
  6. Step 6: Final answer
    x = 18,688.16

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.