Home / 91,109.60-136,536.40-72,421.60

Finding the Fourth Proportional to 91,109.60, 136,536.40 and 72,421.60

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Solution

The fourth proportional to 91,109.60, 136,536.40 and 72,421.60 is: 108,530.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,109.60 : 136,536.40 = 72,421.60 : x
  2. Step 2: Convert to fraction form
    91,109.60/136,536.40 = 72,421.60/x
  3. Step 3: Cross multiply
    91,109.60x = 136,536.40 × 72,421.60
  4. Step 4: Simplify right side
    91,109.60x = 9,888,184,546.24
  5. Step 5: Solve for x
    x = 9,888,184,546.24/91,109.60
  6. Step 6: Final answer
    x = 108,530.65

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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.