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Finding the Fourth Proportional to 78,699.99, 117,985.65 and 36,606.33

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Solution

The fourth proportional to 78,699.99, 117,985.65 and 36,606.33 is: 54,879.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,699.99 : 117,985.65 = 36,606.33 : x
  2. Step 2: Convert to fraction form
    78,699.99/117,985.65 = 36,606.33/x
  3. Step 3: Cross multiply
    78,699.99x = 117,985.65 × 36,606.33
  4. Step 4: Simplify right side
    78,699.99x = 4,319,021,639.16
  5. Step 5: Solve for x
    x = 4,319,021,639.16/78,699.99
  6. Step 6: Final answer
    x = 54,879.57

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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.