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Finding the Fourth Proportional to 647.95, 971.61 and 215.05

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Solution

The fourth proportional to 647.95, 971.61 and 215.05 is: 322.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.95 : 971.61 = 215.05 : x
  2. Step 2: Convert to fraction form
    647.95/971.61 = 215.05/x
  3. Step 3: Cross multiply
    647.95x = 971.61 × 215.05
  4. Step 4: Simplify right side
    647.95x = 208,944.73
  5. Step 5: Solve for x
    x = 208,944.73/647.95
  6. Step 6: Final answer
    x = 322.47

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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.