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Finding the Fourth Proportional to 587.13, 810.90 and 390.30

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Solution

The fourth proportional to 587.13, 810.90 and 390.30 is: 539.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    587.13 : 810.90 = 390.30 : x
  2. Step 2: Convert to fraction form
    587.13/810.90 = 390.30/x
  3. Step 3: Cross multiply
    587.13x = 810.90 × 390.30
  4. Step 4: Simplify right side
    587.13x = 316,494.27
  5. Step 5: Solve for x
    x = 316,494.27/587.13
  6. Step 6: Final answer
    x = 539.05

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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.