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Finding the Fourth Proportional to 1,090.69, 1,505.05 and 648.70

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Solution

The fourth proportional to 1,090.69, 1,505.05 and 648.70 is: 895.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,090.69 : 1,505.05 = 648.70 : x
  2. Step 2: Convert to fraction form
    1,090.69/1,505.05 = 648.70/x
  3. Step 3: Cross multiply
    1,090.69x = 1,505.05 × 648.70
  4. Step 4: Simplify right side
    1,090.69x = 976,320.55
  5. Step 5: Solve for x
    x = 976,320.55/1,090.69
  6. Step 6: Final answer
    x = 895.14

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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.