Home / 20,921.15-31,381.62-9,827.78

Finding the Fourth Proportional to 20,921.15, 31,381.62 and 9,827.78

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Solution

The fourth proportional to 20,921.15, 31,381.62 and 9,827.78 is: 14,741.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,921.15 : 31,381.62 = 9,827.78 : x
  2. Step 2: Convert to fraction form
    20,921.15/31,381.62 = 9,827.78/x
  3. Step 3: Cross multiply
    20,921.15x = 31,381.62 × 9,827.78
  4. Step 4: Simplify right side
    20,921.15x = 308,411,657.40
  5. Step 5: Solve for x
    x = 308,411,657.40/20,921.15
  6. Step 6: Final answer
    x = 14,741.62

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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.