Home / 31,138.78-42,971.16-16,991.86

Finding the Fourth Proportional to 31,138.78, 42,971.16 and 16,991.86

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Solution

The fourth proportional to 31,138.78, 42,971.16 and 16,991.86 is: 23,448.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,138.78 : 42,971.16 = 16,991.86 : x
  2. Step 2: Convert to fraction form
    31,138.78/42,971.16 = 16,991.86/x
  3. Step 3: Cross multiply
    31,138.78x = 42,971.16 × 16,991.86
  4. Step 4: Simplify right side
    31,138.78x = 730,159,934.76
  5. Step 5: Solve for x
    x = 730,159,934.76/31,138.78
  6. Step 6: Final answer
    x = 23,448.57

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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.