Home / 21,157.98-31,731.75-8,681.55

Finding the Fourth Proportional to 21,157.98, 31,731.75 and 8,681.55

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Solution

The fourth proportional to 21,157.98, 31,731.75 and 8,681.55 is: 13,020.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,157.98 : 31,731.75 = 8,681.55 : x
  2. Step 2: Convert to fraction form
    21,157.98/31,731.75 = 8,681.55/x
  3. Step 3: Cross multiply
    21,157.98x = 31,731.75 × 8,681.55
  4. Step 4: Simplify right side
    21,157.98x = 275,480,774.21
  5. Step 5: Solve for x
    x = 275,480,774.21/21,157.98
  6. Step 6: Final answer
    x = 13,020.18

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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.