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Finding the Fourth Proportional to 587.03, 809.69 and 390.51

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Solution

The fourth proportional to 587.03, 809.69 and 390.51 is: 538.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    587.03 : 809.69 = 390.51 : x
  2. Step 2: Convert to fraction form
    587.03/809.69 = 390.51/x
  3. Step 3: Cross multiply
    587.03x = 809.69 × 390.51
  4. Step 4: Simplify right side
    587.03x = 316,190.09
  5. Step 5: Solve for x
    x = 316,190.09/587.03
  6. Step 6: Final answer
    x = 538.63

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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.