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Finding the Fourth Proportional to 1,109.32, 1,662.90 and 621.30

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Solution

The fourth proportional to 1,109.32, 1,662.90 and 621.30 is: 931.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,109.32 : 1,662.90 = 621.30 : x
  2. Step 2: Convert to fraction form
    1,109.32/1,662.90 = 621.30/x
  3. Step 3: Cross multiply
    1,109.32x = 1,662.90 × 621.30
  4. Step 4: Simplify right side
    1,109.32x = 1,033,159.77
  5. Step 5: Solve for x
    x = 1,033,159.77/1,109.32
  6. Step 6: Final answer
    x = 931.35

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.