Home / 30,929.04-42,680.88-18,990.72

Finding the Fourth Proportional to 30,929.04, 42,680.88 and 18,990.72

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Solution

The fourth proportional to 30,929.04, 42,680.88 and 18,990.72 is: 26,206.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,929.04 : 42,680.88 = 18,990.72 : x
  2. Step 2: Convert to fraction form
    30,929.04/42,680.88 = 18,990.72/x
  3. Step 3: Cross multiply
    30,929.04x = 42,680.88 × 18,990.72
  4. Step 4: Simplify right side
    30,929.04x = 810,540,641.43
  5. Step 5: Solve for x
    x = 810,540,641.43/30,929.04
  6. Step 6: Final answer
    x = 26,206.46

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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.