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Finding the Fourth Proportional to 975.99, 1,347.45 and 644.97

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Solution

The fourth proportional to 975.99, 1,347.45 and 644.97 is: 890.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    975.99 : 1,347.45 = 644.97 : x
  2. Step 2: Convert to fraction form
    975.99/1,347.45 = 644.97/x
  3. Step 3: Cross multiply
    975.99x = 1,347.45 × 644.97
  4. Step 4: Simplify right side
    975.99x = 869,064.83
  5. Step 5: Solve for x
    x = 869,064.83/975.99
  6. Step 6: Final answer
    x = 890.44

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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.