Home / 21,135.40-31,705.26-7,281.16

Finding the Fourth Proportional to 21,135.40, 31,705.26 and 7,281.16

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Solution

The fourth proportional to 21,135.40, 31,705.26 and 7,281.16 is: 10,922.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,135.40 : 31,705.26 = 7,281.16 : x
  2. Step 2: Convert to fraction form
    21,135.40/31,705.26 = 7,281.16/x
  3. Step 3: Cross multiply
    21,135.40x = 31,705.26 × 7,281.16
  4. Step 4: Simplify right side
    21,135.40x = 230,851,070.90
  5. Step 5: Solve for x
    x = 230,851,070.90/21,135.40
  6. Step 6: Final answer
    x = 10,922.48

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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.