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Finding the Fourth Proportional to 587.70, 810.08 and 398.58

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Solution

The fourth proportional to 587.70, 810.08 and 398.58 is: 549.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    587.70 : 810.08 = 398.58 : x
  2. Step 2: Convert to fraction form
    587.70/810.08 = 398.58/x
  3. Step 3: Cross multiply
    587.70x = 810.08 × 398.58
  4. Step 4: Simplify right side
    587.70x = 322,879.69
  5. Step 5: Solve for x
    x = 322,879.69/587.70
  6. Step 6: Final answer
    x = 549.40

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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.