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Finding the Fourth Proportional to 587.15, 810.51 and 390.94

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Solution

The fourth proportional to 587.15, 810.51 and 390.94 is: 539.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    587.15 : 810.51 = 390.94 : x
  2. Step 2: Convert to fraction form
    587.15/810.51 = 390.94/x
  3. Step 3: Cross multiply
    587.15x = 810.51 × 390.94
  4. Step 4: Simplify right side
    587.15x = 316,860.78
  5. Step 5: Solve for x
    x = 316,860.78/587.15
  6. Step 6: Final answer
    x = 539.66

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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.