Home / 20,852.34-28,775.13-11,420.70

Finding the Fourth Proportional to 20,852.34, 28,775.13 and 11,420.70

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Solution

The fourth proportional to 20,852.34, 28,775.13 and 11,420.70 is: 15,759.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,852.34 : 28,775.13 = 11,420.70 : x
  2. Step 2: Convert to fraction form
    20,852.34/28,775.13 = 11,420.70/x
  3. Step 3: Cross multiply
    20,852.34x = 28,775.13 × 11,420.70
  4. Step 4: Simplify right side
    20,852.34x = 328,632,127.19
  5. Step 5: Solve for x
    x = 328,632,127.19/20,852.34
  6. Step 6: Final answer
    x = 15,759.96

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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.