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Finding the Fourth Proportional to 1,160.39, 1,740.60 and 390.89

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Solution

The fourth proportional to 1,160.39, 1,740.60 and 390.89 is: 586.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,160.39 : 1,740.60 = 390.89 : x
  2. Step 2: Convert to fraction form
    1,160.39/1,740.60 = 390.89/x
  3. Step 3: Cross multiply
    1,160.39x = 1,740.60 × 390.89
  4. Step 4: Simplify right side
    1,160.39x = 680,383.13
  5. Step 5: Solve for x
    x = 680,383.13/1,160.39
  6. Step 6: Final answer
    x = 586.34

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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.