Home / 20,378.10-30,521.99-15,663.40

Finding the Fourth Proportional to 20,378.10, 30,521.99 and 15,663.40

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Solution

The fourth proportional to 20,378.10, 30,521.99 and 15,663.40 is: 23,460.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,378.10 : 30,521.99 = 15,663.40 : x
  2. Step 2: Convert to fraction form
    20,378.10/30,521.99 = 15,663.40/x
  3. Step 3: Cross multiply
    20,378.10x = 30,521.99 × 15,663.40
  4. Step 4: Simplify right side
    20,378.10x = 478,078,138.17
  5. Step 5: Solve for x
    x = 478,078,138.17/20,378.10
  6. Step 6: Final answer
    x = 23,460.39

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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.