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Finding the Fourth Proportional to 1,172.68, 1,618.32 and 648.76

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Solution

The fourth proportional to 1,172.68, 1,618.32 and 648.76 is: 895.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.68 : 1,618.32 = 648.76 : x
  2. Step 2: Convert to fraction form
    1,172.68/1,618.32 = 648.76/x
  3. Step 3: Cross multiply
    1,172.68x = 1,618.32 × 648.76
  4. Step 4: Simplify right side
    1,172.68x = 1,049,901.28
  5. Step 5: Solve for x
    x = 1,049,901.28/1,172.68
  6. Step 6: Final answer
    x = 895.30

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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.