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Finding the Fourth Proportional to 30,871.04, 42,592.04 and 18,928.40

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Solution

The fourth proportional to 30,871.04, 42,592.04 and 18,928.40 is: 26,115.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,871.04 : 42,592.04 = 18,928.40 : x
  2. Step 2: Convert to fraction form
    30,871.04/42,592.04 = 18,928.40/x
  3. Step 3: Cross multiply
    30,871.04x = 42,592.04 × 18,928.40
  4. Step 4: Simplify right side
    30,871.04x = 806,199,169.94
  5. Step 5: Solve for x
    x = 806,199,169.94/30,871.04
  6. Step 6: Final answer
    x = 26,115.06

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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.