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Finding the Fourth Proportional to 1,071.36, 1,603.80 and 956.88

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Solution

The fourth proportional to 1,071.36, 1,603.80 and 956.88 is: 1,432.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,071.36 : 1,603.80 = 956.88 : x
  2. Step 2: Convert to fraction form
    1,071.36/1,603.80 = 956.88/x
  3. Step 3: Cross multiply
    1,071.36x = 1,603.80 × 956.88
  4. Step 4: Simplify right side
    1,071.36x = 1,534,644.14
  5. Step 5: Solve for x
    x = 1,534,644.14/1,071.36
  6. Step 6: Final answer
    x = 1,432.43

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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.