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Finding the Fourth Proportional to 1,200.35, 1,656.24 and 920.90

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Solution

The fourth proportional to 1,200.35, 1,656.24 and 920.90 is: 1,270.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,200.35 : 1,656.24 = 920.90 : x
  2. Step 2: Convert to fraction form
    1,200.35/1,656.24 = 920.90/x
  3. Step 3: Cross multiply
    1,200.35x = 1,656.24 × 920.90
  4. Step 4: Simplify right side
    1,200.35x = 1,525,231.42
  5. Step 5: Solve for x
    x = 1,525,231.42/1,200.35
  6. Step 6: Final answer
    x = 1,270.66

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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.