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Finding the Fourth Proportional to 979.93, 1,352.51 and 625.77

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Solution

The fourth proportional to 979.93, 1,352.51 and 625.77 is: 863.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.93 : 1,352.51 = 625.77 : x
  2. Step 2: Convert to fraction form
    979.93/1,352.51 = 625.77/x
  3. Step 3: Cross multiply
    979.93x = 1,352.51 × 625.77
  4. Step 4: Simplify right side
    979.93x = 846,359.40
  5. Step 5: Solve for x
    x = 846,359.40/979.93
  6. Step 6: Final answer
    x = 863.69

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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.