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Finding the Fourth Proportional to 1,004.57, 1,386.26 and 556.45

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Solution

The fourth proportional to 1,004.57, 1,386.26 and 556.45 is: 767.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,004.57 : 1,386.26 = 556.45 : x
  2. Step 2: Convert to fraction form
    1,004.57/1,386.26 = 556.45/x
  3. Step 3: Cross multiply
    1,004.57x = 1,386.26 × 556.45
  4. Step 4: Simplify right side
    1,004.57x = 771,382.30
  5. Step 5: Solve for x
    x = 771,382.30/1,004.57
  6. Step 6: Final answer
    x = 767.88

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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.