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Finding the Fourth Proportional to 1,038.56, 1,551.81 and 786.74

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Solution

The fourth proportional to 1,038.56, 1,551.81 and 786.74 is: 1,175.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.56 : 1,551.81 = 786.74 : x
  2. Step 2: Convert to fraction form
    1,038.56/1,551.81 = 786.74/x
  3. Step 3: Cross multiply
    1,038.56x = 1,551.81 × 786.74
  4. Step 4: Simplify right side
    1,038.56x = 1,220,871.00
  5. Step 5: Solve for x
    x = 1,220,871.00/1,038.56
  6. Step 6: Final answer
    x = 1,175.54

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.