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Finding the Fourth Proportional to 76,985.20, 115,477.80 and 35,513.20

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Solution

The fourth proportional to 76,985.20, 115,477.80 and 35,513.20 is: 53,269.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,985.20 : 115,477.80 = 35,513.20 : x
  2. Step 2: Convert to fraction form
    76,985.20/115,477.80 = 35,513.20/x
  3. Step 3: Cross multiply
    76,985.20x = 115,477.80 × 35,513.20
  4. Step 4: Simplify right side
    76,985.20x = 4,100,986,206.96
  5. Step 5: Solve for x
    x = 4,100,986,206.96/76,985.20
  6. Step 6: Final answer
    x = 53,269.80

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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.