Home / 30,986.80-42,760.40-16,839.28

Finding the Fourth Proportional to 30,986.80, 42,760.40 and 16,839.28

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Solution

The fourth proportional to 30,986.80, 42,760.40 and 16,839.28 is: 23,237.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,986.80 : 42,760.40 = 16,839.28 : x
  2. Step 2: Convert to fraction form
    30,986.80/42,760.40 = 16,839.28/x
  3. Step 3: Cross multiply
    30,986.80x = 42,760.40 × 16,839.28
  4. Step 4: Simplify right side
    30,986.80x = 720,054,348.51
  5. Step 5: Solve for x
    x = 720,054,348.51/30,986.80
  6. Step 6: Final answer
    x = 23,237.45

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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.