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Finding the Fourth Proportional to 587.50, 810.94 and 390.97

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Solution

The fourth proportional to 587.50, 810.94 and 390.97 is: 539.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    587.50 : 810.94 = 390.97 : x
  2. Step 2: Convert to fraction form
    587.50/810.94 = 390.97/x
  3. Step 3: Cross multiply
    587.50x = 810.94 × 390.97
  4. Step 4: Simplify right side
    587.50x = 317,053.21
  5. Step 5: Solve for x
    x = 317,053.21/587.50
  6. Step 6: Final answer
    x = 539.67

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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.