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Finding the Fourth Proportional to 76,436.80, 114,655.20 and 53,108.80

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Solution

The fourth proportional to 76,436.80, 114,655.20 and 53,108.80 is: 79,663.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,436.80 : 114,655.20 = 53,108.80 : x
  2. Step 2: Convert to fraction form
    76,436.80/114,655.20 = 53,108.80/x
  3. Step 3: Cross multiply
    76,436.80x = 114,655.20 × 53,108.80
  4. Step 4: Simplify right side
    76,436.80x = 6,089,200,085.76
  5. Step 5: Solve for x
    x = 6,089,200,085.76/76,436.80
  6. Step 6: Final answer
    x = 79,663.20

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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.