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Finding the Fourth Proportional to 540.86, 810.74 and 387.77

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Solution

The fourth proportional to 540.86, 810.74 and 387.77 is: 581.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    540.86 : 810.74 = 387.77 : x
  2. Step 2: Convert to fraction form
    540.86/810.74 = 387.77/x
  3. Step 3: Cross multiply
    540.86x = 810.74 × 387.77
  4. Step 4: Simplify right side
    540.86x = 314,374.66
  5. Step 5: Solve for x
    x = 314,374.66/540.86
  6. Step 6: Final answer
    x = 581.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.