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Finding the Fourth Proportional to 1,145, 1,717.50 and 375.50

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Solution

The fourth proportional to 1,145, 1,717.50 and 375.50 is: 563.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145 : 1,717.50 = 375.50 : x
  2. Step 2: Convert to fraction form
    1,145/1,717.50 = 375.50/x
  3. Step 3: Cross multiply
    1,145x = 1,717.50 × 375.50
  4. Step 4: Simplify right side
    1,145x = 644,921.25
  5. Step 5: Solve for x
    x = 644,921.25/1,145
  6. Step 6: Final answer
    x = 563.25

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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.