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Finding the Fourth Proportional to 1,220.08, 1,683.96 and 777.90

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Solution

The fourth proportional to 1,220.08, 1,683.96 and 777.90 is: 1,073.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.08 : 1,683.96 = 777.90 : x
  2. Step 2: Convert to fraction form
    1,220.08/1,683.96 = 777.90/x
  3. Step 3: Cross multiply
    1,220.08x = 1,683.96 × 777.90
  4. Step 4: Simplify right side
    1,220.08x = 1,309,952.48
  5. Step 5: Solve for x
    x = 1,309,952.48/1,220.08
  6. Step 6: Final answer
    x = 1,073.66

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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.