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Finding the Fourth Proportional to 491.60, 665.10 and 491.60

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Solution

The fourth proportional to 491.60, 665.10 and 491.60 is: 665.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.60 : 665.10 = 491.60 : x
  2. Step 2: Convert to fraction form
    491.60/665.10 = 491.60/x
  3. Step 3: Cross multiply
    491.60x = 665.10 × 491.60
  4. Step 4: Simplify right side
    491.60x = 326,963.16
  5. Step 5: Solve for x
    x = 326,963.16/491.60
  6. Step 6: Final answer
    x = 665.10

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Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.