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Finding the Fourth Proportional to 387,404.36, 581,106.60 and 106,921.64

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Solution

The fourth proportional to 387,404.36, 581,106.60 and 106,921.64 is: 160,382.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,404.36 : 581,106.60 = 106,921.64 : x
  2. Step 2: Convert to fraction form
    387,404.36/581,106.60 = 106,921.64/x
  3. Step 3: Cross multiply
    387,404.36x = 581,106.60 × 106,921.64
  4. Step 4: Simplify right side
    387,404.36x = 62,132,870,686.82
  5. Step 5: Solve for x
    x = 62,132,870,686.82/387,404.36
  6. Step 6: Final answer
    x = 160,382.48

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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.