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Finding the Fourth Proportional to 979.71, 1,352.45 and 626.12

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Solution

The fourth proportional to 979.71, 1,352.45 and 626.12 is: 864.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.71 : 1,352.45 = 626.12 : x
  2. Step 2: Convert to fraction form
    979.71/1,352.45 = 626.12/x
  3. Step 3: Cross multiply
    979.71x = 1,352.45 × 626.12
  4. Step 4: Simplify right side
    979.71x = 846,786.10
  5. Step 5: Solve for x
    x = 846,786.10/979.71
  6. Step 6: Final answer
    x = 864.32

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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.