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Finding the Fourth Proportional to 1,120.83, 1,547.45 and 825.58

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Solution

The fourth proportional to 1,120.83, 1,547.45 and 825.58 is: 1,139.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.83 : 1,547.45 = 825.58 : x
  2. Step 2: Convert to fraction form
    1,120.83/1,547.45 = 825.58/x
  3. Step 3: Cross multiply
    1,120.83x = 1,547.45 × 825.58
  4. Step 4: Simplify right side
    1,120.83x = 1,277,543.77
  5. Step 5: Solve for x
    x = 1,277,543.77/1,120.83
  6. Step 6: Final answer
    x = 1,139.82

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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.