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Finding the Fourth Proportional to 1,455.78, 2,009.88 and 1,123.68

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Solution

The fourth proportional to 1,455.78, 2,009.88 and 1,123.68 is: 1,551.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,455.78 : 2,009.88 = 1,123.68 : x
  2. Step 2: Convert to fraction form
    1,455.78/2,009.88 = 1,123.68/x
  3. Step 3: Cross multiply
    1,455.78x = 2,009.88 × 1,123.68
  4. Step 4: Simplify right side
    1,455.78x = 2,258,461.96
  5. Step 5: Solve for x
    x = 2,258,461.96/1,455.78
  6. Step 6: Final answer
    x = 1,551.38

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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.