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Finding the Fourth Proportional to 21,275.88, 31,928.39 and 7,424.88

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Solution

The fourth proportional to 21,275.88, 31,928.39 and 7,424.88 is: 11,142.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,275.88 : 31,928.39 = 7,424.88 : x
  2. Step 2: Convert to fraction form
    21,275.88/31,928.39 = 7,424.88/x
  3. Step 3: Cross multiply
    21,275.88x = 31,928.39 × 7,424.88
  4. Step 4: Simplify right side
    21,275.88x = 237,064,464.34
  5. Step 5: Solve for x
    x = 237,064,464.34/21,275.88
  6. Step 6: Final answer
    x = 11,142.40

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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.