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Finding the Fourth Proportional to 217,820.78, 300,557.40 and 136,139.40

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Solution

The fourth proportional to 217,820.78, 300,557.40 and 136,139.40 is: 187,850.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,820.78 : 300,557.40 = 136,139.40 : x
  2. Step 2: Convert to fraction form
    217,820.78/300,557.40 = 136,139.40/x
  3. Step 3: Cross multiply
    217,820.78x = 300,557.40 × 136,139.40
  4. Step 4: Simplify right side
    217,820.78x = 40,917,702,598.77
  5. Step 5: Solve for x
    x = 40,917,702,598.77/217,820.78
  6. Step 6: Final answer
    x = 187,850.32

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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.