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Finding the Fourth Proportional to 910.34, 1,257.91 and 647.90

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Solution

The fourth proportional to 910.34, 1,257.91 and 647.90 is: 895.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.34 : 1,257.91 = 647.90 : x
  2. Step 2: Convert to fraction form
    910.34/1,257.91 = 647.90/x
  3. Step 3: Cross multiply
    910.34x = 1,257.91 × 647.90
  4. Step 4: Simplify right side
    910.34x = 814,993.60
  5. Step 5: Solve for x
    x = 814,993.60/910.34
  6. Step 6: Final answer
    x = 895.27

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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.