Home / 20,603.45-28,432.66-11,172.01

Finding the Fourth Proportional to 20,603.45, 28,432.66 and 11,172.01

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Solution

The fourth proportional to 20,603.45, 28,432.66 and 11,172.01 is: 15,417.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,603.45 : 28,432.66 = 11,172.01 : x
  2. Step 2: Convert to fraction form
    20,603.45/28,432.66 = 11,172.01/x
  3. Step 3: Cross multiply
    20,603.45x = 28,432.66 × 11,172.01
  4. Step 4: Simplify right side
    20,603.45x = 317,649,961.85
  5. Step 5: Solve for x
    x = 317,649,961.85/20,603.45
  6. Step 6: Final answer
    x = 15,417.32

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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.