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Finding the Fourth Proportional to 387,080.62, 580,564.61 and 120,779.18

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Solution

The fourth proportional to 387,080.62, 580,564.61 and 120,779.18 is: 181,151.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,080.62 : 580,564.61 = 120,779.18 : x
  2. Step 2: Convert to fraction form
    387,080.62/580,564.61 = 120,779.18/x
  3. Step 3: Cross multiply
    387,080.62x = 580,564.61 × 120,779.18
  4. Step 4: Simplify right side
    387,080.62x = 70,120,117,532.82
  5. Step 5: Solve for x
    x = 70,120,117,532.82/387,080.62
  6. Step 6: Final answer
    x = 181,151.20

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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.