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Finding the Fourth Proportional to 491.55, 678.08 and 417.87

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Solution

The fourth proportional to 491.55, 678.08 and 417.87 is: 576.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.55 : 678.08 = 417.87 : x
  2. Step 2: Convert to fraction form
    491.55/678.08 = 417.87/x
  3. Step 3: Cross multiply
    491.55x = 678.08 × 417.87
  4. Step 4: Simplify right side
    491.55x = 283,347.20
  5. Step 5: Solve for x
    x = 283,347.20/491.55
  6. Step 6: Final answer
    x = 576.44

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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.