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Finding the Fourth Proportional to 433.65, 647.12 and 387.50

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Solution

The fourth proportional to 433.65, 647.12 and 387.50 is: 578.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    433.65 : 647.12 = 387.50 : x
  2. Step 2: Convert to fraction form
    433.65/647.12 = 387.50/x
  3. Step 3: Cross multiply
    433.65x = 647.12 × 387.50
  4. Step 4: Simplify right side
    433.65x = 250,759
  5. Step 5: Solve for x
    x = 250,759/433.65
  6. Step 6: Final answer
    x = 578.25

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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.