Home / 12,688.02-17,516.10-7,909.42

Finding the Fourth Proportional to 12,688.02, 17,516.10 and 7,909.42

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Solution

The fourth proportional to 12,688.02, 17,516.10 and 7,909.42 is: 10,919.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,688.02 : 17,516.10 = 7,909.42 : x
  2. Step 2: Convert to fraction form
    12,688.02/17,516.10 = 7,909.42/x
  3. Step 3: Cross multiply
    12,688.02x = 17,516.10 × 7,909.42
  4. Step 4: Simplify right side
    12,688.02x = 138,542,191.66
  5. Step 5: Solve for x
    x = 138,542,191.66/12,688.02
  6. Step 6: Final answer
    x = 10,919.13

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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.