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Finding the Fourth Proportional to 1,035.78, 1,551.69 and 916.80

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Solution

The fourth proportional to 1,035.78, 1,551.69 and 916.80 is: 1,373.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,035.78 : 1,551.69 = 916.80 : x
  2. Step 2: Convert to fraction form
    1,035.78/1,551.69 = 916.80/x
  3. Step 3: Cross multiply
    1,035.78x = 1,551.69 × 916.80
  4. Step 4: Simplify right side
    1,035.78x = 1,422,589.39
  5. Step 5: Solve for x
    x = 1,422,589.39/1,035.78
  6. Step 6: Final answer
    x = 1,373.45

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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.