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Finding the Fourth Proportional to 216,879.30, 299,293.40 and 121,386

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Solution

The fourth proportional to 216,879.30, 299,293.40 and 121,386 is: 167,512.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    216,879.30 : 299,293.40 = 121,386 : x
  2. Step 2: Convert to fraction form
    216,879.30/299,293.40 = 121,386/x
  3. Step 3: Cross multiply
    216,879.30x = 299,293.40 × 121,386
  4. Step 4: Simplify right side
    216,879.30x = 36,330,028,652.40
  5. Step 5: Solve for x
    x = 36,330,028,652.40/216,879.30
  6. Step 6: Final answer
    x = 167,512.66

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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.