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Finding the Fourth Proportional to 1,145.70, 1,717.78 and 528.57

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Solution

The fourth proportional to 1,145.70, 1,717.78 and 528.57 is: 792.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.70 : 1,717.78 = 528.57 : x
  2. Step 2: Convert to fraction form
    1,145.70/1,717.78 = 528.57/x
  3. Step 3: Cross multiply
    1,145.70x = 1,717.78 × 528.57
  4. Step 4: Simplify right side
    1,145.70x = 907,966.97
  5. Step 5: Solve for x
    x = 907,966.97/1,145.70
  6. Step 6: Final answer
    x = 792.50

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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.