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Finding the Fourth Proportional to 1,220.75, 1,684.64 and 661.22

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Solution

The fourth proportional to 1,220.75, 1,684.64 and 661.22 is: 912.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.75 : 1,684.64 = 661.22 : x
  2. Step 2: Convert to fraction form
    1,220.75/1,684.64 = 661.22/x
  3. Step 3: Cross multiply
    1,220.75x = 1,684.64 × 661.22
  4. Step 4: Simplify right side
    1,220.75x = 1,113,916.65
  5. Step 5: Solve for x
    x = 1,113,916.65/1,220.75
  6. Step 6: Final answer
    x = 912.49

Related Problems

Find fourth proportional to 610.38, 842.32 and 330.61
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.