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Finding the Fourth Proportional to 643.07, 964.18 and 253.11

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Solution

The fourth proportional to 643.07, 964.18 and 253.11 is: 379.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.07 : 964.18 = 253.11 : x
  2. Step 2: Convert to fraction form
    643.07/964.18 = 253.11/x
  3. Step 3: Cross multiply
    643.07x = 964.18 × 253.11
  4. Step 4: Simplify right side
    643.07x = 244,043.60
  5. Step 5: Solve for x
    x = 244,043.60/643.07
  6. Step 6: Final answer
    x = 379.50

Related Problems

Find fourth proportional to 321.54, 482.09 and 126.56
Half scale
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Double scale
Find fourth proportional to 644.07, 965.68 and 254.11
Similar ratio
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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.