Home / 18,905.10-28,357.65-13,000.20

Finding the Fourth Proportional to 18,905.10, 28,357.65 and 13,000.20

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Solution

The fourth proportional to 18,905.10, 28,357.65 and 13,000.20 is: 19,500.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,905.10 : 28,357.65 = 13,000.20 : x
  2. Step 2: Convert to fraction form
    18,905.10/28,357.65 = 13,000.20/x
  3. Step 3: Cross multiply
    18,905.10x = 28,357.65 × 13,000.20
  4. Step 4: Simplify right side
    18,905.10x = 368,655,121.53
  5. Step 5: Solve for x
    x = 368,655,121.53/18,905.10
  6. Step 6: Final answer
    x = 19,500.30

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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.