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Finding the Fourth Proportional to 1,004.78, 1,386.60 and 585.38

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Solution

The fourth proportional to 1,004.78, 1,386.60 and 585.38 is: 807.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,004.78 : 1,386.60 = 585.38 : x
  2. Step 2: Convert to fraction form
    1,004.78/1,386.60 = 585.38/x
  3. Step 3: Cross multiply
    1,004.78x = 1,386.60 × 585.38
  4. Step 4: Simplify right side
    1,004.78x = 811,687.91
  5. Step 5: Solve for x
    x = 811,687.91/1,004.78
  6. Step 6: Final answer
    x = 807.83

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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.