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Finding the Fourth Proportional to 1,220.66, 1,684.50 and 661.12

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Solution

The fourth proportional to 1,220.66, 1,684.50 and 661.12 is: 912.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.66 : 1,684.50 = 661.12 : x
  2. Step 2: Convert to fraction form
    1,220.66/1,684.50 = 661.12/x
  3. Step 3: Cross multiply
    1,220.66x = 1,684.50 × 661.12
  4. Step 4: Simplify right side
    1,220.66x = 1,113,656.64
  5. Step 5: Solve for x
    x = 1,113,656.64/1,220.66
  6. Step 6: Final answer
    x = 912.34

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Half scale
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Double 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.