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Finding the Fourth Proportional to 159,918.30, 239,877.45 and 81,186.30

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Solution

The fourth proportional to 159,918.30, 239,877.45 and 81,186.30 is: 121,779.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    159,918.30 : 239,877.45 = 81,186.30 : x
  2. Step 2: Convert to fraction form
    159,918.30/239,877.45 = 81,186.30/x
  3. Step 3: Cross multiply
    159,918.30x = 239,877.45 × 81,186.30
  4. Step 4: Simplify right side
    159,918.30x = 19,474,762,618.94
  5. Step 5: Solve for x
    x = 19,474,762,618.94/159,918.30
  6. Step 6: Final answer
    x = 121,779.45

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1.5x scale

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.