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Finding the Fourth Proportional to 1,181.76, 1,631.36 and 716

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Solution

The fourth proportional to 1,181.76, 1,631.36 and 716 is: 988.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,181.76 : 1,631.36 = 716 : x
  2. Step 2: Convert to fraction form
    1,181.76/1,631.36 = 716/x
  3. Step 3: Cross multiply
    1,181.76x = 1,631.36 × 716
  4. Step 4: Simplify right side
    1,181.76x = 1,168,053.76
  5. Step 5: Solve for x
    x = 1,168,053.76/1,181.76
  6. Step 6: Final answer
    x = 988.40

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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.