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Finding the Fourth Proportional to 1,125.45, 1,553.10 and 628.05

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Solution

The fourth proportional to 1,125.45, 1,553.10 and 628.05 is: 866.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.45 : 1,553.10 = 628.05 : x
  2. Step 2: Convert to fraction form
    1,125.45/1,553.10 = 628.05/x
  3. Step 3: Cross multiply
    1,125.45x = 1,553.10 × 628.05
  4. Step 4: Simplify right side
    1,125.45x = 975,424.46
  5. Step 5: Solve for x
    x = 975,424.46/1,125.45
  6. Step 6: Final answer
    x = 866.70

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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.