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Finding the Fourth Proportional to 1,841.16, 2,762.28 and 687

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Solution

The fourth proportional to 1,841.16, 2,762.28 and 687 is: 1,030.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,841.16 : 2,762.28 = 687 : x
  2. Step 2: Convert to fraction form
    1,841.16/2,762.28 = 687/x
  3. Step 3: Cross multiply
    1,841.16x = 2,762.28 × 687
  4. Step 4: Simplify right side
    1,841.16x = 1,897,686.36
  5. Step 5: Solve for x
    x = 1,897,686.36/1,841.16
  6. Step 6: Final answer
    x = 1,030.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.