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Finding the Fourth Proportional to 86,752.69, 129,399.80 and 78,779.86

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Solution

The fourth proportional to 86,752.69, 129,399.80 and 78,779.86 is: 117,507.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,752.69 : 129,399.80 = 78,779.86 : x
  2. Step 2: Convert to fraction form
    86,752.69/129,399.80 = 78,779.86/x
  3. Step 3: Cross multiply
    86,752.69x = 129,399.80 × 78,779.86
  4. Step 4: Simplify right side
    86,752.69x = 10,194,097,410.63
  5. Step 5: Solve for x
    x = 10,194,097,410.63/86,752.69
  6. Step 6: Final answer
    x = 117,507.57

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.