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Finding the Fourth Proportional to 153,379.71, 211,662.32 and 85,395.20

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Solution

The fourth proportional to 153,379.71, 211,662.32 and 85,395.20 is: 117,844.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,379.71 : 211,662.32 = 85,395.20 : x
  2. Step 2: Convert to fraction form
    153,379.71/211,662.32 = 85,395.20/x
  3. Step 3: Cross multiply
    153,379.71x = 211,662.32 × 85,395.20
  4. Step 4: Simplify right side
    153,379.71x = 18,074,944,663.58
  5. Step 5: Solve for x
    x = 18,074,944,663.58/153,379.71
  6. Step 6: Final answer
    x = 117,844.43

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.