Home / 30,935.79-42,691.50-18,999.09

Finding the Fourth Proportional to 30,935.79, 42,691.50 and 18,999.09

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Solution

The fourth proportional to 30,935.79, 42,691.50 and 18,999.09 is: 26,218.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,935.79 : 42,691.50 = 18,999.09 : x
  2. Step 2: Convert to fraction form
    30,935.79/42,691.50 = 18,999.09/x
  3. Step 3: Cross multiply
    30,935.79x = 42,691.50 × 18,999.09
  4. Step 4: Simplify right side
    30,935.79x = 811,099,650.74
  5. Step 5: Solve for x
    x = 811,099,650.74/30,935.79
  6. Step 6: Final answer
    x = 26,218.81

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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.