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Finding the Fourth Proportional to 1,291.38, 1,782 and 899.25

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Solution

The fourth proportional to 1,291.38, 1,782 and 899.25 is: 1,240.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.38 : 1,782 = 899.25 : x
  2. Step 2: Convert to fraction form
    1,291.38/1,782 = 899.25/x
  3. Step 3: Cross multiply
    1,291.38x = 1,782 × 899.25
  4. Step 4: Simplify right side
    1,291.38x = 1,602,463.50
  5. Step 5: Solve for x
    x = 1,602,463.50/1,291.38
  6. Step 6: Final answer
    x = 1,240.89

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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.