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Finding the Fourth Proportional to 338,739.71, 508,109.76 and 86,039.15

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Solution

The fourth proportional to 338,739.71, 508,109.76 and 86,039.15 is: 129,058.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    338,739.71 : 508,109.76 = 86,039.15 : x
  2. Step 2: Convert to fraction form
    338,739.71/508,109.76 = 86,039.15/x
  3. Step 3: Cross multiply
    338,739.71x = 508,109.76 × 86,039.15
  4. Step 4: Simplify right side
    338,739.71x = 43,717,331,857.10
  5. Step 5: Solve for x
    x = 43,717,331,857.10/338,739.71
  6. Step 6: Final answer
    x = 129,058.77

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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.