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Finding the Fourth Proportional to 647.61, 971.30 and 318.46

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Solution

The fourth proportional to 647.61, 971.30 and 318.46 is: 477.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.61 : 971.30 = 318.46 : x
  2. Step 2: Convert to fraction form
    647.61/971.30 = 318.46/x
  3. Step 3: Cross multiply
    647.61x = 971.30 × 318.46
  4. Step 4: Simplify right side
    647.61x = 309,320.20
  5. Step 5: Solve for x
    x = 309,320.20/647.61
  6. Step 6: Final answer
    x = 477.64

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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.