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Finding the Fourth Proportional to 388.90, 578.77 and 374.32

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Solution

The fourth proportional to 388.90, 578.77 and 374.32 is: 557.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.90 : 578.77 = 374.32 : x
  2. Step 2: Convert to fraction form
    388.90/578.77 = 374.32/x
  3. Step 3: Cross multiply
    388.90x = 578.77 × 374.32
  4. Step 4: Simplify right side
    388.90x = 216,646.03
  5. Step 5: Solve for x
    x = 216,646.03/388.90
  6. Step 6: Final answer
    x = 557.07

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.