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Finding the Fourth Proportional to 1,520.78, 2,280.38 and 698.34

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Solution

The fourth proportional to 1,520.78, 2,280.38 and 698.34 is: 1,047.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,520.78 : 2,280.38 = 698.34 : x
  2. Step 2: Convert to fraction form
    1,520.78/2,280.38 = 698.34/x
  3. Step 3: Cross multiply
    1,520.78x = 2,280.38 × 698.34
  4. Step 4: Simplify right side
    1,520.78x = 1,592,477.08
  5. Step 5: Solve for x
    x = 1,592,477.08/1,520.78
  6. Step 6: Final answer
    x = 1,047.15

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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.