Home / 21,090.16-31,638.88-8,616.96

Finding the Fourth Proportional to 21,090.16, 31,638.88 and 8,616.96

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Solution

The fourth proportional to 21,090.16, 31,638.88 and 8,616.96 is: 12,926.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,090.16 : 31,638.88 = 8,616.96 : x
  2. Step 2: Convert to fraction form
    21,090.16/31,638.88 = 8,616.96/x
  3. Step 3: Cross multiply
    21,090.16x = 31,638.88 × 8,616.96
  4. Step 4: Simplify right side
    21,090.16x = 272,630,963.40
  5. Step 5: Solve for x
    x = 272,630,963.40/21,090.16
  6. Step 6: Final answer
    x = 12,926.93

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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.