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Finding the Fourth Proportional to 15,719.56, 21,695.12 and 14,390.89

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Solution

The fourth proportional to 15,719.56, 21,695.12 and 14,390.89 is: 19,861.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,719.56 : 21,695.12 = 14,390.89 : x
  2. Step 2: Convert to fraction form
    15,719.56/21,695.12 = 14,390.89/x
  3. Step 3: Cross multiply
    15,719.56x = 21,695.12 × 14,390.89
  4. Step 4: Simplify right side
    15,719.56x = 312,212,013.50
  5. Step 5: Solve for x
    x = 312,212,013.50/15,719.56
  6. Step 6: Final answer
    x = 19,861.37

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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.