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Finding the Fourth Proportional to 1,132.65, 1,698.21 and 392.07

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Solution

The fourth proportional to 1,132.65, 1,698.21 and 392.07 is: 587.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,132.65 : 1,698.21 = 392.07 : x
  2. Step 2: Convert to fraction form
    1,132.65/1,698.21 = 392.07/x
  3. Step 3: Cross multiply
    1,132.65x = 1,698.21 × 392.07
  4. Step 4: Simplify right side
    1,132.65x = 665,817.19
  5. Step 5: Solve for x
    x = 665,817.19/1,132.65
  6. Step 6: Final answer
    x = 587.84

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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.