Home / 31,422.18-47,128.40-20,406.98

Finding the Fourth Proportional to 31,422.18, 47,128.40 and 20,406.98

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Solution

The fourth proportional to 31,422.18, 47,128.40 and 20,406.98 is: 30,607.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,422.18 : 47,128.40 = 20,406.98 : x
  2. Step 2: Convert to fraction form
    31,422.18/47,128.40 = 20,406.98/x
  3. Step 3: Cross multiply
    31,422.18x = 47,128.40 × 20,406.98
  4. Step 4: Simplify right side
    31,422.18x = 961,748,316.23
  5. Step 5: Solve for x
    x = 961,748,316.23/31,422.18
  6. Step 6: Final answer
    x = 30,607.31

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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.