Home / 20,430.36-28,201.85-12,875.21

Finding the Fourth Proportional to 20,430.36, 28,201.85 and 12,875.21

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Solution

The fourth proportional to 20,430.36, 28,201.85 and 12,875.21 is: 17,772.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,430.36 : 28,201.85 = 12,875.21 : x
  2. Step 2: Convert to fraction form
    20,430.36/28,201.85 = 12,875.21/x
  3. Step 3: Cross multiply
    20,430.36x = 28,201.85 × 12,875.21
  4. Step 4: Simplify right side
    20,430.36x = 363,104,535.75
  5. Step 5: Solve for x
    x = 363,104,535.75/20,430.36
  6. Step 6: Final answer
    x = 17,772.80

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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.