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Finding the Fourth Proportional to 993.78, 1,370.78 and 783.89

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Solution

The fourth proportional to 993.78, 1,370.78 and 783.89 is: 1,081.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.78 : 1,370.78 = 783.89 : x
  2. Step 2: Convert to fraction form
    993.78/1,370.78 = 783.89/x
  3. Step 3: Cross multiply
    993.78x = 1,370.78 × 783.89
  4. Step 4: Simplify right side
    993.78x = 1,074,532.90
  5. Step 5: Solve for x
    x = 1,074,532.90/993.78
  6. Step 6: Final answer
    x = 1,081.26

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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.