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Finding the Fourth Proportional to 1,209.56, 1,669.16 and 685.64

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Solution

The fourth proportional to 1,209.56, 1,669.16 and 685.64 is: 946.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.56 : 1,669.16 = 685.64 : x
  2. Step 2: Convert to fraction form
    1,209.56/1,669.16 = 685.64/x
  3. Step 3: Cross multiply
    1,209.56x = 1,669.16 × 685.64
  4. Step 4: Simplify right side
    1,209.56x = 1,144,442.86
  5. Step 5: Solve for x
    x = 1,144,442.86/1,209.56
  6. Step 6: Final answer
    x = 946.16

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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.