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Finding the Fourth Proportional to 612,143.50, 918,268.17 and 168,911.50

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Solution

The fourth proportional to 612,143.50, 918,268.17 and 168,911.50 is: 253,381.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,143.50 : 918,268.17 = 168,911.50 : x
  2. Step 2: Convert to fraction form
    612,143.50/918,268.17 = 168,911.50/x
  3. Step 3: Cross multiply
    612,143.50x = 918,268.17 × 168,911.50
  4. Step 4: Simplify right side
    612,143.50x = 155,106,053,996.96
  5. Step 5: Solve for x
    x = 155,106,053,996.96/612,143.50
  6. Step 6: Final answer
    x = 253,381.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.