Home / 21,031.76-31,549.36-6,991.28

Finding the Fourth Proportional to 21,031.76, 31,549.36 and 6,991.28

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Solution

The fourth proportional to 21,031.76, 31,549.36 and 6,991.28 is: 10,487.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,031.76 : 31,549.36 = 6,991.28 : x
  2. Step 2: Convert to fraction form
    21,031.76/31,549.36 = 6,991.28/x
  3. Step 3: Cross multiply
    21,031.76x = 31,549.36 × 6,991.28
  4. Step 4: Simplify right side
    21,031.76x = 220,570,409.58
  5. Step 5: Solve for x
    x = 220,570,409.58/21,031.76
  6. Step 6: Final answer
    x = 10,487.49

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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.