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Finding the Fourth Proportional to 1,392.48, 2,087.21 and 697.47

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Solution

The fourth proportional to 1,392.48, 2,087.21 and 697.47 is: 1,045.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.48 : 2,087.21 = 697.47 : x
  2. Step 2: Convert to fraction form
    1,392.48/2,087.21 = 697.47/x
  3. Step 3: Cross multiply
    1,392.48x = 2,087.21 × 697.47
  4. Step 4: Simplify right side
    1,392.48x = 1,455,766.36
  5. Step 5: Solve for x
    x = 1,455,766.36/1,392.48
  6. Step 6: Final answer
    x = 1,045.45

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1.5x scale

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.