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Finding the Fourth Proportional to 1,228.72, 1,695.76 and 697.60

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Solution

The fourth proportional to 1,228.72, 1,695.76 and 697.60 is: 962.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,228.72 : 1,695.76 = 697.60 : x
  2. Step 2: Convert to fraction form
    1,228.72/1,695.76 = 697.60/x
  3. Step 3: Cross multiply
    1,228.72x = 1,695.76 × 697.60
  4. Step 4: Simplify right side
    1,228.72x = 1,182,962.18
  5. Step 5: Solve for x
    x = 1,182,962.18/1,228.72
  6. Step 6: Final answer
    x = 962.76

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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.