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Finding the Fourth Proportional to 1,405.35, 2,108.78 and 528.45

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Solution

The fourth proportional to 1,405.35, 2,108.78 and 528.45 is: 792.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.35 : 2,108.78 = 528.45 : x
  2. Step 2: Convert to fraction form
    1,405.35/2,108.78 = 528.45/x
  3. Step 3: Cross multiply
    1,405.35x = 2,108.78 × 528.45
  4. Step 4: Simplify right side
    1,405.35x = 1,114,371.60
  5. Step 5: Solve for x
    x = 1,114,371.60/1,405.35
  6. Step 6: Final answer
    x = 792.95

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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.