Home / 20,989.18-28,962.12-11,558.35

Finding the Fourth Proportional to 20,989.18, 28,962.12 and 11,558.35

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Solution

The fourth proportional to 20,989.18, 28,962.12 and 11,558.35 is: 15,948.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,989.18 : 28,962.12 = 11,558.35 : x
  2. Step 2: Convert to fraction form
    20,989.18/28,962.12 = 11,558.35/x
  3. Step 3: Cross multiply
    20,989.18x = 28,962.12 × 11,558.35
  4. Step 4: Simplify right side
    20,989.18x = 334,754,319.70
  5. Step 5: Solve for x
    x = 334,754,319.70/20,989.18
  6. Step 6: Final answer
    x = 15,948.90

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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.