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Finding the Fourth Proportional to 1,078.90, 1,615.65 and 711.70

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Solution

The fourth proportional to 1,078.90, 1,615.65 and 711.70 is: 1,065.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.90 : 1,615.65 = 711.70 : x
  2. Step 2: Convert to fraction form
    1,078.90/1,615.65 = 711.70/x
  3. Step 3: Cross multiply
    1,078.90x = 1,615.65 × 711.70
  4. Step 4: Simplify right side
    1,078.90x = 1,149,858.11
  5. Step 5: Solve for x
    x = 1,149,858.11/1,078.90
  6. Step 6: Final answer
    x = 1,065.77

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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.