Home / 30,942.81-42,679.01-28,398.78

Finding the Fourth Proportional to 30,942.81, 42,679.01 and 28,398.78

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Solution

The fourth proportional to 30,942.81, 42,679.01 and 28,398.78 is: 39,170.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,942.81 : 42,679.01 = 28,398.78 : x
  2. Step 2: Convert to fraction form
    30,942.81/42,679.01 = 28,398.78/x
  3. Step 3: Cross multiply
    30,942.81x = 42,679.01 × 28,398.78
  4. Step 4: Simplify right side
    30,942.81x = 1,212,031,673.61
  5. Step 5: Solve for x
    x = 1,212,031,673.61/30,942.81
  6. Step 6: Final answer
    x = 39,170.06

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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.