Home / 31,128.60-42,958.04-16,981.40

Finding the Fourth Proportional to 31,128.60, 42,958.04 and 16,981.40

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Solution

The fourth proportional to 31,128.60, 42,958.04 and 16,981.40 is: 23,434.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,128.60 : 42,958.04 = 16,981.40 : x
  2. Step 2: Convert to fraction form
    31,128.60/42,958.04 = 16,981.40/x
  3. Step 3: Cross multiply
    31,128.60x = 42,958.04 × 16,981.40
  4. Step 4: Simplify right side
    31,128.60x = 729,487,660.46
  5. Step 5: Solve for x
    x = 729,487,660.46/31,128.60
  6. Step 6: Final answer
    x = 23,434.64

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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.