Home / 21,971-30,319.98-12,539.36

Finding the Fourth Proportional to 21,971, 30,319.98 and 12,539.36

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Solution

The fourth proportional to 21,971, 30,319.98 and 12,539.36 is: 17,304.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,971 : 30,319.98 = 12,539.36 : x
  2. Step 2: Convert to fraction form
    21,971/30,319.98 = 12,539.36/x
  3. Step 3: Cross multiply
    21,971x = 30,319.98 × 12,539.36
  4. Step 4: Simplify right side
    21,971x = 380,193,144.41
  5. Step 5: Solve for x
    x = 380,193,144.41/21,971
  6. Step 6: Final answer
    x = 17,304.32

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.