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Finding the Fourth Proportional to 1,078.40, 1,617.76 and 347.84

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Solution

The fourth proportional to 1,078.40, 1,617.76 and 347.84 is: 521.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.40 : 1,617.76 = 347.84 : x
  2. Step 2: Convert to fraction form
    1,078.40/1,617.76 = 347.84/x
  3. Step 3: Cross multiply
    1,078.40x = 1,617.76 × 347.84
  4. Step 4: Simplify right side
    1,078.40x = 562,721.64
  5. Step 5: Solve for x
    x = 562,721.64/1,078.40
  6. Step 6: Final answer
    x = 521.81

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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.