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Finding the Fourth Proportional to 578.61, 798.57 and 485.19

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Solution

The fourth proportional to 578.61, 798.57 and 485.19 is: 669.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.61 : 798.57 = 485.19 : x
  2. Step 2: Convert to fraction form
    578.61/798.57 = 485.19/x
  3. Step 3: Cross multiply
    578.61x = 798.57 × 485.19
  4. Step 4: Simplify right side
    578.61x = 387,458.18
  5. Step 5: Solve for x
    x = 387,458.18/578.61
  6. Step 6: Final answer
    x = 669.64

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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.