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Finding the Fourth Proportional to 216,775.78, 299,155.89 and 121,288.66

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Solution

The fourth proportional to 216,775.78, 299,155.89 and 121,288.66 is: 167,381.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    216,775.78 : 299,155.89 = 121,288.66 : x
  2. Step 2: Convert to fraction form
    216,775.78/299,155.89 = 121,288.66/x
  3. Step 3: Cross multiply
    216,775.78x = 299,155.89 × 121,288.66
  4. Step 4: Simplify right side
    216,775.78x = 36,284,217,029.21
  5. Step 5: Solve for x
    x = 36,284,217,029.21/216,775.78
  6. Step 6: Final answer
    x = 167,381.32

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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.