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Finding the Fourth Proportional to 21,160.80, 31,752 and 8,690.40

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Solution

The fourth proportional to 21,160.80, 31,752 and 8,690.40 is: 13,040.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,160.80 : 31,752 = 8,690.40 : x
  2. Step 2: Convert to fraction form
    21,160.80/31,752 = 8,690.40/x
  3. Step 3: Cross multiply
    21,160.80x = 31,752 × 8,690.40
  4. Step 4: Simplify right side
    21,160.80x = 275,937,580.80
  5. Step 5: Solve for x
    x = 275,937,580.80/21,160.80
  6. Step 6: Final answer
    x = 13,040.04

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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.