Home / 30,849.98-42,564-20,789.78

Finding the Fourth Proportional to 30,849.98, 42,564 and 20,789.78

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Solution

The fourth proportional to 30,849.98, 42,564 and 20,789.78 is: 28,683.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,849.98 : 42,564 = 20,789.78 : x
  2. Step 2: Convert to fraction form
    30,849.98/42,564 = 20,789.78/x
  3. Step 3: Cross multiply
    30,849.98x = 42,564 × 20,789.78
  4. Step 4: Simplify right side
    30,849.98x = 884,896,195.92
  5. Step 5: Solve for x
    x = 884,896,195.92/30,849.98
  6. Step 6: Final answer
    x = 28,683.85

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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.