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Finding the Fourth Proportional to 1,288.37, 1,777.95 and 698.93

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Solution

The fourth proportional to 1,288.37, 1,777.95 and 698.93 is: 964.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288.37 : 1,777.95 = 698.93 : x
  2. Step 2: Convert to fraction form
    1,288.37/1,777.95 = 698.93/x
  3. Step 3: Cross multiply
    1,288.37x = 1,777.95 × 698.93
  4. Step 4: Simplify right side
    1,288.37x = 1,242,660.37
  5. Step 5: Solve for x
    x = 1,242,660.37/1,288.37
  6. Step 6: Final answer
    x = 964.52

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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.