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Finding the Fourth Proportional to 1,090.50, 1,505.09 and 624.75

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Solution

The fourth proportional to 1,090.50, 1,505.09 and 624.75 is: 862.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,090.50 : 1,505.09 = 624.75 : x
  2. Step 2: Convert to fraction form
    1,090.50/1,505.09 = 624.75/x
  3. Step 3: Cross multiply
    1,090.50x = 1,505.09 × 624.75
  4. Step 4: Simplify right side
    1,090.50x = 940,304.98
  5. Step 5: Solve for x
    x = 940,304.98/1,090.50
  6. Step 6: Final answer
    x = 862.27

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Double scale
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1.5x scale

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.