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Finding the Fourth Proportional to 1,142.08, 1,712.64 and 628.48

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Solution

The fourth proportional to 1,142.08, 1,712.64 and 628.48 is: 942.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,142.08 : 1,712.64 = 628.48 : x
  2. Step 2: Convert to fraction form
    1,142.08/1,712.64 = 628.48/x
  3. Step 3: Cross multiply
    1,142.08x = 1,712.64 × 628.48
  4. Step 4: Simplify right side
    1,142.08x = 1,076,359.99
  5. Step 5: Solve for x
    x = 1,076,359.99/1,142.08
  6. Step 6: Final answer
    x = 942.46

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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.