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Finding the Fourth Proportional to 1,280.00, 1,915.65 and 818.10

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Solution

The fourth proportional to 1,280.00, 1,915.65 and 818.10 is: 1,224.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.00 : 1,915.65 = 818.10 : x
  2. Step 2: Convert to fraction form
    1,280.00/1,915.65 = 818.10/x
  3. Step 3: Cross multiply
    1,280.00x = 1,915.65 × 818.10
  4. Step 4: Simplify right side
    1,280.00x = 1,567,193.27
  5. Step 5: Solve for x
    x = 1,567,193.27/1,280.00
  6. Step 6: Final answer
    x = 1,224.37

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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.