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Finding the Fourth Proportional to 1,385.48, 2,078.15 and 345.49

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Solution

The fourth proportional to 1,385.48, 2,078.15 and 345.49 is: 518.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385.48 : 2,078.15 = 345.49 : x
  2. Step 2: Convert to fraction form
    1,385.48/2,078.15 = 345.49/x
  3. Step 3: Cross multiply
    1,385.48x = 2,078.15 × 345.49
  4. Step 4: Simplify right side
    1,385.48x = 717,973.12
  5. Step 5: Solve for x
    x = 717,973.12/1,385.48
  6. Step 6: Final answer
    x = 518.21

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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.