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Finding the Fourth Proportional to 1,121.68, 1,547.94 and 656.20

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Solution

The fourth proportional to 1,121.68, 1,547.94 and 656.20 is: 905.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.68 : 1,547.94 = 656.20 : x
  2. Step 2: Convert to fraction form
    1,121.68/1,547.94 = 656.20/x
  3. Step 3: Cross multiply
    1,121.68x = 1,547.94 × 656.20
  4. Step 4: Simplify right side
    1,121.68x = 1,015,758.23
  5. Step 5: Solve for x
    x = 1,015,758.23/1,121.68
  6. Step 6: Final answer
    x = 905.57

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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.