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Finding the Fourth Proportional to 980.76, 1,352.86 and 631.32

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Solution

The fourth proportional to 980.76, 1,352.86 and 631.32 is: 870.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.76 : 1,352.86 = 631.32 : x
  2. Step 2: Convert to fraction form
    980.76/1,352.86 = 631.32/x
  3. Step 3: Cross multiply
    980.76x = 1,352.86 × 631.32
  4. Step 4: Simplify right side
    980.76x = 854,087.58
  5. Step 5: Solve for x
    x = 854,087.58/980.76
  6. Step 6: Final answer
    x = 870.84

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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.