Home / 20,908.61-31,374.09-9,815.40

Finding the Fourth Proportional to 20,908.61, 31,374.09 and 9,815.40

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Solution

The fourth proportional to 20,908.61, 31,374.09 and 9,815.40 is: 14,728.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,908.61 : 31,374.09 = 9,815.40 : x
  2. Step 2: Convert to fraction form
    20,908.61/31,374.09 = 9,815.40/x
  3. Step 3: Cross multiply
    20,908.61x = 31,374.09 × 9,815.40
  4. Step 4: Simplify right side
    20,908.61x = 307,949,242.99
  5. Step 5: Solve for x
    x = 307,949,242.99/20,908.61
  6. Step 6: Final answer
    x = 14,728.35

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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.