Home / 21,678.76-29,916.36-12,118.86

Finding the Fourth Proportional to 21,678.76, 29,916.36 and 12,118.86

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Solution

The fourth proportional to 21,678.76, 29,916.36 and 12,118.86 is: 16,723.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,678.76 : 29,916.36 = 12,118.86 : x
  2. Step 2: Convert to fraction form
    21,678.76/29,916.36 = 12,118.86/x
  3. Step 3: Cross multiply
    21,678.76x = 29,916.36 × 12,118.86
  4. Step 4: Simplify right side
    21,678.76x = 362,552,178.55
  5. Step 5: Solve for x
    x = 362,552,178.55/21,678.76
  6. Step 6: Final answer
    x = 16,723.84

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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.