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Finding the Fourth Proportional to 28,187.95, 38,899.85 and 15,440.95

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Solution

The fourth proportional to 28,187.95, 38,899.85 and 15,440.95 is: 21,308.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,187.95 : 38,899.85 = 15,440.95 : x
  2. Step 2: Convert to fraction form
    28,187.95/38,899.85 = 15,440.95/x
  3. Step 3: Cross multiply
    28,187.95x = 38,899.85 × 15,440.95
  4. Step 4: Simplify right side
    28,187.95x = 600,650,638.86
  5. Step 5: Solve for x
    x = 600,650,638.86/28,187.95
  6. Step 6: Final answer
    x = 21,308.77

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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.