Home / 31,108.76-42,905.82-19,931.80

Finding the Fourth Proportional to 31,108.76, 42,905.82 and 19,931.80

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Solution

The fourth proportional to 31,108.76, 42,905.82 and 19,931.80 is: 27,490.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,108.76 : 42,905.82 = 19,931.80 : x
  2. Step 2: Convert to fraction form
    31,108.76/42,905.82 = 19,931.80/x
  3. Step 3: Cross multiply
    31,108.76x = 42,905.82 × 19,931.80
  4. Step 4: Simplify right side
    31,108.76x = 855,190,223.08
  5. Step 5: Solve for x
    x = 855,190,223.08/31,108.76
  6. Step 6: Final answer
    x = 27,490.33

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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.