Home / 20,603.63-28,432.89-11,172.20

Finding the Fourth Proportional to 20,603.63, 28,432.89 and 11,172.20

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Solution

The fourth proportional to 20,603.63, 28,432.89 and 11,172.20 is: 15,417.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,603.63 : 28,432.89 = 11,172.20 : x
  2. Step 2: Convert to fraction form
    20,603.63/28,432.89 = 11,172.20/x
  3. Step 3: Cross multiply
    20,603.63x = 28,432.89 × 11,172.20
  4. Step 4: Simplify right side
    20,603.63x = 317,657,791.49
  5. Step 5: Solve for x
    x = 317,657,791.49/20,603.63
  6. Step 6: Final answer
    x = 15,417.56

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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.