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Finding the Fourth Proportional to 1,180.68, 1,628.94 and 708.72

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Solution

The fourth proportional to 1,180.68, 1,628.94 and 708.72 is: 977.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,180.68 : 1,628.94 = 708.72 : x
  2. Step 2: Convert to fraction form
    1,180.68/1,628.94 = 708.72/x
  3. Step 3: Cross multiply
    1,180.68x = 1,628.94 × 708.72
  4. Step 4: Simplify right side
    1,180.68x = 1,154,462.36
  5. Step 5: Solve for x
    x = 1,154,462.36/1,180.68
  6. Step 6: Final answer
    x = 977.79

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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.