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Finding the Fourth Proportional to 899.78, 1,240.31 and 585

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Solution

The fourth proportional to 899.78, 1,240.31 and 585 is: 806.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    899.78 : 1,240.31 = 585 : x
  2. Step 2: Convert to fraction form
    899.78/1,240.31 = 585/x
  3. Step 3: Cross multiply
    899.78x = 1,240.31 × 585
  4. Step 4: Simplify right side
    899.78x = 725,582.81
  5. Step 5: Solve for x
    x = 725,582.81/899.78
  6. Step 6: Final answer
    x = 806.40

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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.