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Finding the Fourth Proportional to 1,121.30, 1,681.72 and 704.64

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Solution

The fourth proportional to 1,121.30, 1,681.72 and 704.64 is: 1,056.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.30 : 1,681.72 = 704.64 : x
  2. Step 2: Convert to fraction form
    1,121.30/1,681.72 = 704.64/x
  3. Step 3: Cross multiply
    1,121.30x = 1,681.72 × 704.64
  4. Step 4: Simplify right side
    1,121.30x = 1,185,005.42
  5. Step 5: Solve for x
    x = 1,185,005.42/1,121.30
  6. Step 6: Final answer
    x = 1,056.82

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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.