Home / 21,119.86-29,145.72-11,688.76

Finding the Fourth Proportional to 21,119.86, 29,145.72 and 11,688.76

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Solution

The fourth proportional to 21,119.86, 29,145.72 and 11,688.76 is: 16,130.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,119.86 : 29,145.72 = 11,688.76 : x
  2. Step 2: Convert to fraction form
    21,119.86/29,145.72 = 11,688.76/x
  3. Step 3: Cross multiply
    21,119.86x = 29,145.72 × 11,688.76
  4. Step 4: Simplify right side
    21,119.86x = 340,677,326.11
  5. Step 5: Solve for x
    x = 340,677,326.11/21,119.86
  6. Step 6: Final answer
    x = 16,130.66

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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.