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Finding the Fourth Proportional to 215,816.60, 323,749.20 and 66,055.70

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Solution

The fourth proportional to 215,816.60, 323,749.20 and 66,055.70 is: 99,090.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,816.60 : 323,749.20 = 66,055.70 : x
  2. Step 2: Convert to fraction form
    215,816.60/323,749.20 = 66,055.70/x
  3. Step 3: Cross multiply
    215,816.60x = 323,749.20 × 66,055.70
  4. Step 4: Simplify right side
    215,816.60x = 21,385,480,030.44
  5. Step 5: Solve for x
    x = 21,385,480,030.44/215,816.60
  6. Step 6: Final answer
    x = 99,090.99

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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.