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Finding the Fourth Proportional to 1,655.75, 2,285.00 and 909.78

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Solution

The fourth proportional to 1,655.75, 2,285.00 and 909.78 is: 1,255.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,655.75 : 2,285.00 = 909.78 : x
  2. Step 2: Convert to fraction form
    1,655.75/2,285.00 = 909.78/x
  3. Step 3: Cross multiply
    1,655.75x = 2,285.00 × 909.78
  4. Step 4: Simplify right side
    1,655.75x = 2,078,842.75
  5. Step 5: Solve for x
    x = 2,078,842.75/1,655.75
  6. Step 6: Final answer
    x = 1,255.53

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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.