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Finding the Fourth Proportional to 76,688.55, 115,200.54 and 54,643.59

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Solution

The fourth proportional to 76,688.55, 115,200.54 and 54,643.59 is: 82,084.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,688.55 : 115,200.54 = 54,643.59 : x
  2. Step 2: Convert to fraction form
    76,688.55/115,200.54 = 54,643.59/x
  3. Step 3: Cross multiply
    76,688.55x = 115,200.54 × 54,643.59
  4. Step 4: Simplify right side
    76,688.55x = 6,294,971,075.54
  5. Step 5: Solve for x
    x = 6,294,971,075.54/76,688.55
  6. Step 6: Final answer
    x = 82,084.89

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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.