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Finding the Fourth Proportional to 1,777.10, 2,665.71 and 478.60

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Solution

The fourth proportional to 1,777.10, 2,665.71 and 478.60 is: 717.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,777.10 : 2,665.71 = 478.60 : x
  2. Step 2: Convert to fraction form
    1,777.10/2,665.71 = 478.60/x
  3. Step 3: Cross multiply
    1,777.10x = 2,665.71 × 478.60
  4. Step 4: Simplify right side
    1,777.10x = 1,275,802.14
  5. Step 5: Solve for x
    x = 1,275,802.14/1,777.10
  6. Step 6: Final answer
    x = 717.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.