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Finding the Fourth Proportional to 1,918.74, 2,878.13 and 687.03

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Solution

The fourth proportional to 1,918.74, 2,878.13 and 687.03 is: 1,030.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,918.74 : 2,878.13 = 687.03 : x
  2. Step 2: Convert to fraction form
    1,918.74/2,878.13 = 687.03/x
  3. Step 3: Cross multiply
    1,918.74x = 2,878.13 × 687.03
  4. Step 4: Simplify right side
    1,918.74x = 1,977,368.77
  5. Step 5: Solve for x
    x = 1,977,368.77/1,918.74
  6. Step 6: Final answer
    x = 1,030.56

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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.