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Finding the Fourth Proportional to 979.80, 1,352.71 and 648.51

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Solution

The fourth proportional to 979.80, 1,352.71 and 648.51 is: 895.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.80 : 1,352.71 = 648.51 : x
  2. Step 2: Convert to fraction form
    979.80/1,352.71 = 648.51/x
  3. Step 3: Cross multiply
    979.80x = 1,352.71 × 648.51
  4. Step 4: Simplify right side
    979.80x = 877,245.96
  5. Step 5: Solve for x
    x = 877,245.96/979.80
  6. Step 6: Final answer
    x = 895.33

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1.5x scale

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.