Home / 78,421.60-117,308.40-71,500.96

Finding the Fourth Proportional to 78,421.60, 117,308.40 and 71,500.96

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Solution

The fourth proportional to 78,421.60, 117,308.40 and 71,500.96 is: 106,956.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,421.60 : 117,308.40 = 71,500.96 : x
  2. Step 2: Convert to fraction form
    78,421.60/117,308.40 = 71,500.96/x
  3. Step 3: Cross multiply
    78,421.60x = 117,308.40 × 71,500.96
  4. Step 4: Simplify right side
    78,421.60x = 8,387,663,216.06
  5. Step 5: Solve for x
    x = 8,387,663,216.06/78,421.60
  6. Step 6: Final answer
    x = 106,956.03

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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.