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Finding the Fourth Proportional to 1,127.78, 1,555.90 and 655.59

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Solution

The fourth proportional to 1,127.78, 1,555.90 and 655.59 is: 904.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.78 : 1,555.90 = 655.59 : x
  2. Step 2: Convert to fraction form
    1,127.78/1,555.90 = 655.59/x
  3. Step 3: Cross multiply
    1,127.78x = 1,555.90 × 655.59
  4. Step 4: Simplify right side
    1,127.78x = 1,020,036.68
  5. Step 5: Solve for x
    x = 1,020,036.68/1,127.78
  6. Step 6: Final answer
    x = 904.47

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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.