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Finding the Fourth Proportional to 647.52, 970.80 and 318.30

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Solution

The fourth proportional to 647.52, 970.80 and 318.30 is: 477.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.52 : 970.80 = 318.30 : x
  2. Step 2: Convert to fraction form
    647.52/970.80 = 318.30/x
  3. Step 3: Cross multiply
    647.52x = 970.80 × 318.30
  4. Step 4: Simplify right side
    647.52x = 309,005.64
  5. Step 5: Solve for x
    x = 309,005.64/647.52
  6. Step 6: Final answer
    x = 477.21

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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.