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Finding the Fourth Proportional to 145,090.20, 217,808.10 and 81,960.60

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Solution

The fourth proportional to 145,090.20, 217,808.10 and 81,960.60 is: 123,038.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,090.20 : 217,808.10 = 81,960.60 : x
  2. Step 2: Convert to fraction form
    145,090.20/217,808.10 = 81,960.60/x
  3. Step 3: Cross multiply
    145,090.20x = 217,808.10 × 81,960.60
  4. Step 4: Simplify right side
    145,090.20x = 17,851,682,560.86
  5. Step 5: Solve for x
    x = 17,851,682,560.86/145,090.20
  6. Step 6: Final answer
    x = 123,038.51

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1.5x scale

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.