Home / 20,840.17-28,758.40-11,887.35

Finding the Fourth Proportional to 20,840.17, 28,758.40 and 11,887.35

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Solution

The fourth proportional to 20,840.17, 28,758.40 and 11,887.35 is: 16,403.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,840.17 : 28,758.40 = 11,887.35 : x
  2. Step 2: Convert to fraction form
    20,840.17/28,758.40 = 11,887.35/x
  3. Step 3: Cross multiply
    20,840.17x = 28,758.40 × 11,887.35
  4. Step 4: Simplify right side
    20,840.17x = 341,861,166.24
  5. Step 5: Solve for x
    x = 341,861,166.24/20,840.17
  6. Step 6: Final answer
    x = 16,403.95

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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.