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Finding the Fourth Proportional to 1,042.51, 1,568.98 and 783.85

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Solution

The fourth proportional to 1,042.51, 1,568.98 and 783.85 is: 1,179.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042.51 : 1,568.98 = 783.85 : x
  2. Step 2: Convert to fraction form
    1,042.51/1,568.98 = 783.85/x
  3. Step 3: Cross multiply
    1,042.51x = 1,568.98 × 783.85
  4. Step 4: Simplify right side
    1,042.51x = 1,229,837.13
  5. Step 5: Solve for x
    x = 1,229,837.13/1,042.51
  6. Step 6: Final answer
    x = 1,179.69

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.