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Finding the Fourth Proportional to 1,103.58, 1,522.40 and 661.32

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Solution

The fourth proportional to 1,103.58, 1,522.40 and 661.32 is: 912.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,103.58 : 1,522.40 = 661.32 : x
  2. Step 2: Convert to fraction form
    1,103.58/1,522.40 = 661.32/x
  3. Step 3: Cross multiply
    1,103.58x = 1,522.40 × 661.32
  4. Step 4: Simplify right side
    1,103.58x = 1,006,790.26
  5. Step 5: Solve for x
    x = 1,006,790.26/1,103.58
  6. Step 6: Final answer
    x = 912.29

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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.