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Finding the Fourth Proportional to 20,355.57, 28,071.90 and 13,970.90

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Solution

The fourth proportional to 20,355.57, 28,071.90 and 13,970.90 is: 19,266.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,355.57 : 28,071.90 = 13,970.90 : x
  2. Step 2: Convert to fraction form
    20,355.57/28,071.90 = 13,970.90/x
  3. Step 3: Cross multiply
    20,355.57x = 28,071.90 × 13,970.90
  4. Step 4: Simplify right side
    20,355.57x = 392,189,777.89
  5. Step 5: Solve for x
    x = 392,189,777.89/20,355.57
  6. Step 6: Final answer
    x = 19,266.95

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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.