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Finding the Fourth Proportional to 1,127.50, 1,556.10 and 661.75

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Solution

The fourth proportional to 1,127.50, 1,556.10 and 661.75 is: 913.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.50 : 1,556.10 = 661.75 : x
  2. Step 2: Convert to fraction form
    1,127.50/1,556.10 = 661.75/x
  3. Step 3: Cross multiply
    1,127.50x = 1,556.10 × 661.75
  4. Step 4: Simplify right side
    1,127.50x = 1,029,749.18
  5. Step 5: Solve for x
    x = 1,029,749.18/1,127.50
  6. Step 6: Final answer
    x = 913.30

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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.