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Finding the Fourth Proportional to 1,228.65, 1,695.55 and 669.12

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Solution

The fourth proportional to 1,228.65, 1,695.55 and 669.12 is: 923.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,228.65 : 1,695.55 = 669.12 : x
  2. Step 2: Convert to fraction form
    1,228.65/1,695.55 = 669.12/x
  3. Step 3: Cross multiply
    1,228.65x = 1,695.55 × 669.12
  4. Step 4: Simplify right side
    1,228.65x = 1,134,526.42
  5. Step 5: Solve for x
    x = 1,134,526.42/1,228.65
  6. Step 6: Final answer
    x = 923.39

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Half 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.