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Finding the Fourth Proportional to 261,886.50, 361,386.36 and 154,431.90

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Solution

The fourth proportional to 261,886.50, 361,386.36 and 154,431.90 is: 213,105.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,886.50 : 361,386.36 = 154,431.90 : x
  2. Step 2: Convert to fraction form
    261,886.50/361,386.36 = 154,431.90/x
  3. Step 3: Cross multiply
    261,886.50x = 361,386.36 × 154,431.90
  4. Step 4: Simplify right side
    261,886.50x = 55,809,582,208.88
  5. Step 5: Solve for x
    x = 55,809,582,208.88/261,886.50
  6. Step 6: Final answer
    x = 213,105.99

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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.