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Finding the Fourth Proportional to 1,090.64, 1,505.04 and 624.80

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Solution

The fourth proportional to 1,090.64, 1,505.04 and 624.80 is: 862.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,090.64 : 1,505.04 = 624.80 : x
  2. Step 2: Convert to fraction form
    1,090.64/1,505.04 = 624.80/x
  3. Step 3: Cross multiply
    1,090.64x = 1,505.04 × 624.80
  4. Step 4: Simplify right side
    1,090.64x = 940,348.99
  5. Step 5: Solve for x
    x = 940,348.99/1,090.64
  6. Step 6: Final answer
    x = 862.20

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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.