Home / 21,090.27-31,638.20-7,761.45

Finding the Fourth Proportional to 21,090.27, 31,638.20 and 7,761.45

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Solution

The fourth proportional to 21,090.27, 31,638.20 and 7,761.45 is: 11,643.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,090.27 : 31,638.20 = 7,761.45 : x
  2. Step 2: Convert to fraction form
    21,090.27/31,638.20 = 7,761.45/x
  3. Step 3: Cross multiply
    21,090.27x = 31,638.20 × 7,761.45
  4. Step 4: Simplify right side
    21,090.27x = 245,558,307.39
  5. Step 5: Solve for x
    x = 245,558,307.39/21,090.27
  6. Step 6: Final answer
    x = 11,643.20

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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.