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Finding the Fourth Proportional to 643.16, 964.76 and 210.32

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Solution

The fourth proportional to 643.16, 964.76 and 210.32 is: 315.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.16 : 964.76 = 210.32 : x
  2. Step 2: Convert to fraction form
    643.16/964.76 = 210.32/x
  3. Step 3: Cross multiply
    643.16x = 964.76 × 210.32
  4. Step 4: Simplify right side
    643.16x = 202,908.32
  5. Step 5: Solve for x
    x = 202,908.32/643.16
  6. Step 6: Final answer
    x = 315.49

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1.5x scale

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.