Home / 21,292.40-31,918.92-10,881.20

Finding the Fourth Proportional to 21,292.40, 31,918.92 and 10,881.20

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Solution

The fourth proportional to 21,292.40, 31,918.92 and 10,881.20 is: 16,311.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,292.40 : 31,918.92 = 10,881.20 : x
  2. Step 2: Convert to fraction form
    21,292.40/31,918.92 = 10,881.20/x
  3. Step 3: Cross multiply
    21,292.40x = 31,918.92 × 10,881.20
  4. Step 4: Simplify right side
    21,292.40x = 347,316,152.30
  5. Step 5: Solve for x
    x = 347,316,152.30/21,292.40
  6. Step 6: Final answer
    x = 16,311.74

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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.