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Finding the Fourth Proportional to 980.12, 1,352.74 and 947.69

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Solution

The fourth proportional to 980.12, 1,352.74 and 947.69 is: 1,307.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.12 : 1,352.74 = 947.69 : x
  2. Step 2: Convert to fraction form
    980.12/1,352.74 = 947.69/x
  3. Step 3: Cross multiply
    980.12x = 1,352.74 × 947.69
  4. Step 4: Simplify right side
    980.12x = 1,281,971.41
  5. Step 5: Solve for x
    x = 1,281,971.41/980.12
  6. Step 6: Final answer
    x = 1,307.98

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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.