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Finding the Fourth Proportional to 1,121.28, 1,547.52 and 708.48

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Solution

The fourth proportional to 1,121.28, 1,547.52 and 708.48 is: 977.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.28 : 1,547.52 = 708.48 : x
  2. Step 2: Convert to fraction form
    1,121.28/1,547.52 = 708.48/x
  3. Step 3: Cross multiply
    1,121.28x = 1,547.52 × 708.48
  4. Step 4: Simplify right side
    1,121.28x = 1,096,386.97
  5. Step 5: Solve for x
    x = 1,096,386.97/1,121.28
  6. Step 6: Final answer
    x = 977.80

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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.