Home / 31,351.76-47,029.08-7,978.40

Finding the Fourth Proportional to 31,351.76, 47,029.08 and 7,978.40

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Solution

The fourth proportional to 31,351.76, 47,029.08 and 7,978.40 is: 11,967.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,351.76 : 47,029.08 = 7,978.40 : x
  2. Step 2: Convert to fraction form
    31,351.76/47,029.08 = 7,978.40/x
  3. Step 3: Cross multiply
    31,351.76x = 47,029.08 × 7,978.40
  4. Step 4: Simplify right side
    31,351.76x = 375,216,811.87
  5. Step 5: Solve for x
    x = 375,216,811.87/31,351.76
  6. Step 6: Final answer
    x = 11,967.97

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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.