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Finding the Fourth Proportional to 1,220.00, 1,683.60 and 660.47

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Solution

The fourth proportional to 1,220.00, 1,683.60 and 660.47 is: 911.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.00 : 1,683.60 = 660.47 : x
  2. Step 2: Convert to fraction form
    1,220.00/1,683.60 = 660.47/x
  3. Step 3: Cross multiply
    1,220.00x = 1,683.60 × 660.47
  4. Step 4: Simplify right side
    1,220.00x = 1,111,970.56
  5. Step 5: Solve for x
    x = 1,111,970.56/1,220.00
  6. Step 6: Final answer
    x = 911.45

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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.