Home / 20,430.20-28,192.60-11,478.08

Finding the Fourth Proportional to 20,430.20, 28,192.60 and 11,478.08

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Solution

The fourth proportional to 20,430.20, 28,192.60 and 11,478.08 is: 15,839.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,430.20 : 28,192.60 = 11,478.08 : x
  2. Step 2: Convert to fraction form
    20,430.20/28,192.60 = 11,478.08/x
  3. Step 3: Cross multiply
    20,430.20x = 28,192.60 × 11,478.08
  4. Step 4: Simplify right side
    20,430.20x = 323,596,918.21
  5. Step 5: Solve for x
    x = 323,596,918.21/20,430.20
  6. Step 6: Final answer
    x = 15,839.15

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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.