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Finding the Fourth Proportional to 387.02, 579.78 and 354.30

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Solution

The fourth proportional to 387.02, 579.78 and 354.30 is: 530.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.02 : 579.78 = 354.30 : x
  2. Step 2: Convert to fraction form
    387.02/579.78 = 354.30/x
  3. Step 3: Cross multiply
    387.02x = 579.78 × 354.30
  4. Step 4: Simplify right side
    387.02x = 205,416.05
  5. Step 5: Solve for x
    x = 205,416.05/387.02
  6. Step 6: Final answer
    x = 530.77

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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.