Home / 20,880.95-31,306.54-9,781.58

Finding the Fourth Proportional to 20,880.95, 31,306.54 and 9,781.58

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Solution

The fourth proportional to 20,880.95, 31,306.54 and 9,781.58 is: 14,665.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,880.95 : 31,306.54 = 9,781.58 : x
  2. Step 2: Convert to fraction form
    20,880.95/31,306.54 = 9,781.58/x
  3. Step 3: Cross multiply
    20,880.95x = 31,306.54 × 9,781.58
  4. Step 4: Simplify right side
    20,880.95x = 306,227,376.63
  5. Step 5: Solve for x
    x = 306,227,376.63/20,880.95
  6. Step 6: Final answer
    x = 14,665.40

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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.