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Finding the Fourth Proportional to 1,048.85, 1,574.64 and 805.55

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Solution

The fourth proportional to 1,048.85, 1,574.64 and 805.55 is: 1,209.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,048.85 : 1,574.64 = 805.55 : x
  2. Step 2: Convert to fraction form
    1,048.85/1,574.64 = 805.55/x
  3. Step 3: Cross multiply
    1,048.85x = 1,574.64 × 805.55
  4. Step 4: Simplify right side
    1,048.85x = 1,268,443.38
  5. Step 5: Solve for x
    x = 1,268,443.38/1,048.85
  6. Step 6: Final answer
    x = 1,209.37

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.