Home / 67,020.78-100,378-31,985.04

Finding the Fourth Proportional to 67,020.78, 100,378 and 31,985.04

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Solution

The fourth proportional to 67,020.78, 100,378 and 31,985.04 is: 47,904.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,020.78 : 100,378 = 31,985.04 : x
  2. Step 2: Convert to fraction form
    67,020.78/100,378 = 31,985.04/x
  3. Step 3: Cross multiply
    67,020.78x = 100,378 × 31,985.04
  4. Step 4: Simplify right side
    67,020.78x = 3,210,594,345.12
  5. Step 5: Solve for x
    x = 3,210,594,345.12/67,020.78
  6. Step 6: Final answer
    x = 47,904.46

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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.