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Finding the Fourth Proportional to 647.93, 971.87 and 215.07

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Solution

The fourth proportional to 647.93, 971.87 and 215.07 is: 322.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.93 : 971.87 = 215.07 : x
  2. Step 2: Convert to fraction form
    647.93/971.87 = 215.07/x
  3. Step 3: Cross multiply
    647.93x = 971.87 × 215.07
  4. Step 4: Simplify right side
    647.93x = 209,019.01
  5. Step 5: Solve for x
    x = 209,019.01/647.93
  6. Step 6: Final answer
    x = 322.60

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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.