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Finding the Fourth Proportional to 1,777.20, 2,665.59 and 478.77

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Solution

The fourth proportional to 1,777.20, 2,665.59 and 478.77 is: 718.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,777.20 : 2,665.59 = 478.77 : x
  2. Step 2: Convert to fraction form
    1,777.20/2,665.59 = 478.77/x
  3. Step 3: Cross multiply
    1,777.20x = 2,665.59 × 478.77
  4. Step 4: Simplify right side
    1,777.20x = 1,276,204.52
  5. Step 5: Solve for x
    x = 1,276,204.52/1,777.20
  6. Step 6: Final answer
    x = 718.10

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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.