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Finding the Fourth Proportional to 840.61, 1,160.16 and 491.27

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Solution

The fourth proportional to 840.61, 1,160.16 and 491.27 is: 678.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.61 : 1,160.16 = 491.27 : x
  2. Step 2: Convert to fraction form
    840.61/1,160.16 = 491.27/x
  3. Step 3: Cross multiply
    840.61x = 1,160.16 × 491.27
  4. Step 4: Simplify right side
    840.61x = 569,951.80
  5. Step 5: Solve for x
    x = 569,951.80/840.61
  6. Step 6: Final answer
    x = 678.03

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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.