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Finding the Fourth Proportional to 111,407.87, 153,742.21 and 60,420.11

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Solution

The fourth proportional to 111,407.87, 153,742.21 and 60,420.11 is: 83,379.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,407.87 : 153,742.21 = 60,420.11 : x
  2. Step 2: Convert to fraction form
    111,407.87/153,742.21 = 60,420.11/x
  3. Step 3: Cross multiply
    111,407.87x = 153,742.21 × 60,420.11
  4. Step 4: Simplify right side
    111,407.87x = 9,289,120,320.08
  5. Step 5: Solve for x
    x = 9,289,120,320.08/111,407.87
  6. Step 6: Final answer
    x = 83,379.39

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.