Home / 31,012.85-42,809.88-21,985.38

Finding the Fourth Proportional to 31,012.85, 42,809.88 and 21,985.38

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Solution

The fourth proportional to 31,012.85, 42,809.88 and 21,985.38 is: 30,348.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,012.85 : 42,809.88 = 21,985.38 : x
  2. Step 2: Convert to fraction form
    31,012.85/42,809.88 = 21,985.38/x
  3. Step 3: Cross multiply
    31,012.85x = 42,809.88 × 21,985.38
  4. Step 4: Simplify right side
    31,012.85x = 941,191,479.55
  5. Step 5: Solve for x
    x = 941,191,479.55/31,012.85
  6. Step 6: Final answer
    x = 30,348.44

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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.