Home / 19,920.42-29,878.18-5,129.42

Finding the Fourth Proportional to 19,920.42, 29,878.18 and 5,129.42

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Solution

The fourth proportional to 19,920.42, 29,878.18 and 5,129.42 is: 7,693.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,920.42 : 29,878.18 = 5,129.42 : x
  2. Step 2: Convert to fraction form
    19,920.42/29,878.18 = 5,129.42/x
  3. Step 3: Cross multiply
    19,920.42x = 29,878.18 × 5,129.42
  4. Step 4: Simplify right side
    19,920.42x = 153,257,734.06
  5. Step 5: Solve for x
    x = 153,257,734.06/19,920.42
  6. Step 6: Final answer
    x = 7,693.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.