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Finding the Fourth Proportional to 1,457.36, 2,011.87 and 987.73

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Solution

The fourth proportional to 1,457.36, 2,011.87 and 987.73 is: 1,363.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,457.36 : 2,011.87 = 987.73 : x
  2. Step 2: Convert to fraction form
    1,457.36/2,011.87 = 987.73/x
  3. Step 3: Cross multiply
    1,457.36x = 2,011.87 × 987.73
  4. Step 4: Simplify right side
    1,457.36x = 1,987,180.56
  5. Step 5: Solve for x
    x = 1,987,180.56/1,457.36
  6. Step 6: Final answer
    x = 1,363.55

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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.