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Finding the Fourth Proportional to 847.91, 1,170.54 and 647.09

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Solution

The fourth proportional to 847.91, 1,170.54 and 647.09 is: 893.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    847.91 : 1,170.54 = 647.09 : x
  2. Step 2: Convert to fraction form
    847.91/1,170.54 = 647.09/x
  3. Step 3: Cross multiply
    847.91x = 1,170.54 × 647.09
  4. Step 4: Simplify right side
    847.91x = 757,448.03
  5. Step 5: Solve for x
    x = 757,448.03/847.91
  6. Step 6: Final answer
    x = 893.31

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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.