Home / 20,420.95-28,180.57-11,346.12

Finding the Fourth Proportional to 20,420.95, 28,180.57 and 11,346.12

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Solution

The fourth proportional to 20,420.95, 28,180.57 and 11,346.12 is: 15,657.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,420.95 : 28,180.57 = 11,346.12 : x
  2. Step 2: Convert to fraction form
    20,420.95/28,180.57 = 11,346.12/x
  3. Step 3: Cross multiply
    20,420.95x = 28,180.57 × 11,346.12
  4. Step 4: Simplify right side
    20,420.95x = 319,740,128.89
  5. Step 5: Solve for x
    x = 319,740,128.89/20,420.95
  6. Step 6: Final answer
    x = 15,657.46

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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.