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Finding the Fourth Proportional to 76,386.80, 114,666.60 and 45,239.60

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Solution

The fourth proportional to 76,386.80, 114,666.60 and 45,239.60 is: 67,910.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,386.80 : 114,666.60 = 45,239.60 : x
  2. Step 2: Convert to fraction form
    76,386.80/114,666.60 = 45,239.60/x
  3. Step 3: Cross multiply
    76,386.80x = 114,666.60 × 45,239.60
  4. Step 4: Simplify right side
    76,386.80x = 5,187,471,117.36
  5. Step 5: Solve for x
    x = 5,187,471,117.36/76,386.80
  6. Step 6: Final answer
    x = 67,910.57

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1.5x scale

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.