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Finding the Fourth Proportional to 756.78, 1,132.74 and 391.07

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Solution

The fourth proportional to 756.78, 1,132.74 and 391.07 is: 585.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.78 : 1,132.74 = 391.07 : x
  2. Step 2: Convert to fraction form
    756.78/1,132.74 = 391.07/x
  3. Step 3: Cross multiply
    756.78x = 1,132.74 × 391.07
  4. Step 4: Simplify right side
    756.78x = 442,980.63
  5. Step 5: Solve for x
    x = 442,980.63/756.78
  6. Step 6: Final answer
    x = 585.35

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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.