Home / 31,104.36-42,890.13-21,015.30

Finding the Fourth Proportional to 31,104.36, 42,890.13 and 21,015.30

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Solution

The fourth proportional to 31,104.36, 42,890.13 and 21,015.30 is: 28,978.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,104.36 : 42,890.13 = 21,015.30 : x
  2. Step 2: Convert to fraction form
    31,104.36/42,890.13 = 21,015.30/x
  3. Step 3: Cross multiply
    31,104.36x = 42,890.13 × 21,015.30
  4. Step 4: Simplify right side
    31,104.36x = 901,348,948.99
  5. Step 5: Solve for x
    x = 901,348,948.99/31,104.36
  6. Step 6: Final answer
    x = 28,978.22

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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.