Home / 31,128.75-42,957.68-16,981.65

Finding the Fourth Proportional to 31,128.75, 42,957.68 and 16,981.65

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Solution

The fourth proportional to 31,128.75, 42,957.68 and 16,981.65 is: 23,434.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,128.75 : 42,957.68 = 16,981.65 : x
  2. Step 2: Convert to fraction form
    31,128.75/42,957.68 = 16,981.65/x
  3. Step 3: Cross multiply
    31,128.75x = 42,957.68 × 16,981.65
  4. Step 4: Simplify right side
    31,128.75x = 729,492,286.57
  5. Step 5: Solve for x
    x = 729,492,286.57/31,128.75
  6. Step 6: Final answer
    x = 23,434.68

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.