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Finding the Fourth Proportional to 121,985.80, 182,978.70 and 86,556.40

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Solution

The fourth proportional to 121,985.80, 182,978.70 and 86,556.40 is: 129,834.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,985.80 : 182,978.70 = 86,556.40 : x
  2. Step 2: Convert to fraction form
    121,985.80/182,978.70 = 86,556.40/x
  3. Step 3: Cross multiply
    121,985.80x = 182,978.70 × 86,556.40
  4. Step 4: Simplify right side
    121,985.80x = 15,837,977,548.68
  5. Step 5: Solve for x
    x = 15,837,977,548.68/121,985.80
  6. Step 6: Final answer
    x = 129,834.60

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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.