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Finding the Fourth Proportional to 1,121.36, 1,547.68 and 748.40

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Solution

The fourth proportional to 1,121.36, 1,547.68 and 748.40 is: 1,032.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.36 : 1,547.68 = 748.40 : x
  2. Step 2: Convert to fraction form
    1,121.36/1,547.68 = 748.40/x
  3. Step 3: Cross multiply
    1,121.36x = 1,547.68 × 748.40
  4. Step 4: Simplify right side
    1,121.36x = 1,158,283.71
  5. Step 5: Solve for x
    x = 1,158,283.71/1,121.36
  6. Step 6: Final answer
    x = 1,032.93

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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.