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Finding the Fourth Proportional to 30,987.97, 42,763.04 and 16,840.51

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Solution

The fourth proportional to 30,987.97, 42,763.04 and 16,840.51 is: 23,239.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,987.97 : 42,763.04 = 16,840.51 : x
  2. Step 2: Convert to fraction form
    30,987.97/42,763.04 = 16,840.51/x
  3. Step 3: Cross multiply
    30,987.97x = 42,763.04 × 16,840.51
  4. Step 4: Simplify right side
    30,987.97x = 720,151,274.79
  5. Step 5: Solve for x
    x = 720,151,274.79/30,987.97
  6. Step 6: Final answer
    x = 23,239.71

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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.