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Finding the Fourth Proportional to 647.28, 970.86 and 318.10

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Solution

The fourth proportional to 647.28, 970.86 and 318.10 is: 477.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.28 : 970.86 = 318.10 : x
  2. Step 2: Convert to fraction form
    647.28/970.86 = 318.10/x
  3. Step 3: Cross multiply
    647.28x = 970.86 × 318.10
  4. Step 4: Simplify right side
    647.28x = 308,830.57
  5. Step 5: Solve for x
    x = 308,830.57/647.28
  6. Step 6: Final answer
    x = 477.12

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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.