Home / 21,270.98-31,899.28-7,941.21

Finding the Fourth Proportional to 21,270.98, 31,899.28 and 7,941.21

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Solution

The fourth proportional to 21,270.98, 31,899.28 and 7,941.21 is: 11,909.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,270.98 : 31,899.28 = 7,941.21 : x
  2. Step 2: Convert to fraction form
    21,270.98/31,899.28 = 7,941.21/x
  3. Step 3: Cross multiply
    21,270.98x = 31,899.28 × 7,941.21
  4. Step 4: Simplify right side
    21,270.98x = 253,318,961.26
  5. Step 5: Solve for x
    x = 253,318,961.26/21,270.98
  6. Step 6: Final answer
    x = 11,909.14

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1.5x scale

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.