Home / 12,690.16-17,514.47-12,129.51

Finding the Fourth Proportional to 12,690.16, 17,514.47 and 12,129.51

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Solution

The fourth proportional to 12,690.16, 17,514.47 and 12,129.51 is: 16,740.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,690.16 : 17,514.47 = 12,129.51 : x
  2. Step 2: Convert to fraction form
    12,690.16/17,514.47 = 12,129.51/x
  3. Step 3: Cross multiply
    12,690.16x = 17,514.47 × 12,129.51
  4. Step 4: Simplify right side
    12,690.16x = 212,441,939.01
  5. Step 5: Solve for x
    x = 212,441,939.01/12,690.16
  6. Step 6: Final answer
    x = 16,740.68

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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.