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Finding the Fourth Proportional to 975.85, 1,347.12 and 626.74

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Solution

The fourth proportional to 975.85, 1,347.12 and 626.74 is: 865.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    975.85 : 1,347.12 = 626.74 : x
  2. Step 2: Convert to fraction form
    975.85/1,347.12 = 626.74/x
  3. Step 3: Cross multiply
    975.85x = 1,347.12 × 626.74
  4. Step 4: Simplify right side
    975.85x = 844,293.99
  5. Step 5: Solve for x
    x = 844,293.99/975.85
  6. Step 6: Final answer
    x = 865.19

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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.