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Finding the Fourth Proportional to 1,070.66, 1,606.60 and 421.85

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Solution

The fourth proportional to 1,070.66, 1,606.60 and 421.85 is: 633.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,070.66 : 1,606.60 = 421.85 : x
  2. Step 2: Convert to fraction form
    1,070.66/1,606.60 = 421.85/x
  3. Step 3: Cross multiply
    1,070.66x = 1,606.60 × 421.85
  4. Step 4: Simplify right side
    1,070.66x = 677,744.55
  5. Step 5: Solve for x
    x = 677,744.55/1,070.66
  6. Step 6: Final answer
    x = 633.02

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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.