Home / 31,078.98-42,888.89-16,931.78

Finding the Fourth Proportional to 31,078.98, 42,888.89 and 16,931.78

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Solution

The fourth proportional to 31,078.98, 42,888.89 and 16,931.78 is: 23,365.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,078.98 : 42,888.89 = 16,931.78 : x
  2. Step 2: Convert to fraction form
    31,078.98/42,888.89 = 16,931.78/x
  3. Step 3: Cross multiply
    31,078.98x = 42,888.89 × 16,931.78
  4. Step 4: Simplify right side
    31,078.98x = 726,185,249.92
  5. Step 5: Solve for x
    x = 726,185,249.92/31,078.98
  6. Step 6: Final answer
    x = 23,365.80

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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.