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Finding the Fourth Proportional to 265,619.58, 398,487.72 and 78,645.66

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Solution

The fourth proportional to 265,619.58, 398,487.72 and 78,645.66 is: 117,985.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    265,619.58 : 398,487.72 = 78,645.66 : x
  2. Step 2: Convert to fraction form
    265,619.58/398,487.72 = 78,645.66/x
  3. Step 3: Cross multiply
    265,619.58x = 398,487.72 × 78,645.66
  4. Step 4: Simplify right side
    265,619.58x = 31,339,329,741.30
  5. Step 5: Solve for x
    x = 31,339,329,741.30/265,619.58
  6. Step 6: Final answer
    x = 117,985.77

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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.