Home / 30,788.97-42,426-21,231.78

Finding the Fourth Proportional to 30,788.97, 42,426 and 21,231.78

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Solution

The fourth proportional to 30,788.97, 42,426 and 21,231.78 is: 29,256.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,788.97 : 42,426 = 21,231.78 : x
  2. Step 2: Convert to fraction form
    30,788.97/42,426 = 21,231.78/x
  3. Step 3: Cross multiply
    30,788.97x = 42,426 × 21,231.78
  4. Step 4: Simplify right side
    30,788.97x = 900,779,498.28
  5. Step 5: Solve for x
    x = 900,779,498.28/30,788.97
  6. Step 6: Final answer
    x = 29,256.56

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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.