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Finding the Fourth Proportional to 265,811.72, 398,649.12 and 78,779.48

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Solution

The fourth proportional to 265,811.72, 398,649.12 and 78,779.48 is: 118,148.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    265,811.72 : 398,649.12 = 78,779.48 : x
  2. Step 2: Convert to fraction form
    265,811.72/398,649.12 = 78,779.48/x
  3. Step 3: Cross multiply
    265,811.72x = 398,649.12 × 78,779.48
  4. Step 4: Simplify right side
    265,811.72x = 31,405,370,376.06
  5. Step 5: Solve for x
    x = 31,405,370,376.06/265,811.72
  6. Step 6: Final answer
    x = 118,148.93

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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.