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Finding the Fourth Proportional to 19,311.95, 28,978.89 and 10,427.17

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Solution

The fourth proportional to 19,311.95, 28,978.89 and 10,427.17 is: 15,646.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,311.95 : 28,978.89 = 10,427.17 : x
  2. Step 2: Convert to fraction form
    19,311.95/28,978.89 = 10,427.17/x
  3. Step 3: Cross multiply
    19,311.95x = 28,978.89 × 10,427.17
  4. Step 4: Simplify right side
    19,311.95x = 302,167,812.44
  5. Step 5: Solve for x
    x = 302,167,812.44/19,311.95
  6. Step 6: Final answer
    x = 15,646.68

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.