Home / 30,687.60-42,317.40-21,732.72

Finding the Fourth Proportional to 30,687.60, 42,317.40 and 21,732.72

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Solution

The fourth proportional to 30,687.60, 42,317.40 and 21,732.72 is: 29,968.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,687.60 : 42,317.40 = 21,732.72 : x
  2. Step 2: Convert to fraction form
    30,687.60/42,317.40 = 21,732.72/x
  3. Step 3: Cross multiply
    30,687.60x = 42,317.40 × 21,732.72
  4. Step 4: Simplify right side
    30,687.60x = 919,672,205.33
  5. Step 5: Solve for x
    x = 919,672,205.33/30,687.60
  6. Step 6: Final answer
    x = 29,968.85

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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.