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Finding the Fourth Proportional to 652.15, 985.62 and 640.81

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Solution

The fourth proportional to 652.15, 985.62 and 640.81 is: 968.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    652.15 : 985.62 = 640.81 : x
  2. Step 2: Convert to fraction form
    652.15/985.62 = 640.81/x
  3. Step 3: Cross multiply
    652.15x = 985.62 × 640.81
  4. Step 4: Simplify right side
    652.15x = 631,587.02
  5. Step 5: Solve for x
    x = 631,587.02/652.15
  6. Step 6: Final answer
    x = 968.48

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.