Home / 31,840.80-47,761.20-18,686.40

Finding the Fourth Proportional to 31,840.80, 47,761.20 and 18,686.40

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Solution

The fourth proportional to 31,840.80, 47,761.20 and 18,686.40 is: 28,029.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,840.80 : 47,761.20 = 18,686.40 : x
  2. Step 2: Convert to fraction form
    31,840.80/47,761.20 = 18,686.40/x
  3. Step 3: Cross multiply
    31,840.80x = 47,761.20 × 18,686.40
  4. Step 4: Simplify right side
    31,840.80x = 892,484,887.68
  5. Step 5: Solve for x
    x = 892,484,887.68/31,840.80
  6. Step 6: Final answer
    x = 28,029.60

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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.