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Finding the Fourth Proportional to 1,064.40, 1,468.68 and 644.88

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Solution

The fourth proportional to 1,064.40, 1,468.68 and 644.88 is: 889.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,064.40 : 1,468.68 = 644.88 : x
  2. Step 2: Convert to fraction form
    1,064.40/1,468.68 = 644.88/x
  3. Step 3: Cross multiply
    1,064.40x = 1,468.68 × 644.88
  4. Step 4: Simplify right side
    1,064.40x = 947,122.36
  5. Step 5: Solve for x
    x = 947,122.36/1,064.40
  6. Step 6: Final answer
    x = 889.82

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.