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Finding the Fourth Proportional to 1,160.50, 1,740.84 and 391

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Solution

The fourth proportional to 1,160.50, 1,740.84 and 391 is: 586.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,160.50 : 1,740.84 = 391 : x
  2. Step 2: Convert to fraction form
    1,160.50/1,740.84 = 391/x
  3. Step 3: Cross multiply
    1,160.50x = 1,740.84 × 391
  4. Step 4: Simplify right side
    1,160.50x = 680,668.44
  5. Step 5: Solve for x
    x = 680,668.44/1,160.50
  6. Step 6: Final answer
    x = 586.53

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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.