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Finding the Fourth Proportional to 647.98, 969.54 and 387.02

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Solution

The fourth proportional to 647.98, 969.54 and 387.02 is: 579.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.98 : 969.54 = 387.02 : x
  2. Step 2: Convert to fraction form
    647.98/969.54 = 387.02/x
  3. Step 3: Cross multiply
    647.98x = 969.54 × 387.02
  4. Step 4: Simplify right side
    647.98x = 375,231.37
  5. Step 5: Solve for x
    x = 375,231.37/647.98
  6. Step 6: Final answer
    x = 579.08

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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.