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Finding the Fourth Proportional to 841.18, 1,160.82 and 491.87

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Solution

The fourth proportional to 841.18, 1,160.82 and 491.87 is: 678.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    841.18 : 1,160.82 = 491.87 : x
  2. Step 2: Convert to fraction form
    841.18/1,160.82 = 491.87/x
  3. Step 3: Cross multiply
    841.18x = 1,160.82 × 491.87
  4. Step 4: Simplify right side
    841.18x = 570,971.08
  5. Step 5: Solve for x
    x = 570,971.08/841.18
  6. Step 6: Final answer
    x = 678.77

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.