Home / 20,430.78-28,189.50-12,470.10

Finding the Fourth Proportional to 20,430.78, 28,189.50 and 12,470.10

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Solution

The fourth proportional to 20,430.78, 28,189.50 and 12,470.10 is: 17,205.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,430.78 : 28,189.50 = 12,470.10 : x
  2. Step 2: Convert to fraction form
    20,430.78/28,189.50 = 12,470.10/x
  3. Step 3: Cross multiply
    20,430.78x = 28,189.50 × 12,470.10
  4. Step 4: Simplify right side
    20,430.78x = 351,525,883.95
  5. Step 5: Solve for x
    x = 351,525,883.95/20,430.78
  6. Step 6: Final answer
    x = 17,205.70

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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.