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Finding the Fourth Proportional to 899.86, 1,242.39 and 550.75

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Solution

The fourth proportional to 899.86, 1,242.39 and 550.75 is: 760.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    899.86 : 1,242.39 = 550.75 : x
  2. Step 2: Convert to fraction form
    899.86/1,242.39 = 550.75/x
  3. Step 3: Cross multiply
    899.86x = 1,242.39 × 550.75
  4. Step 4: Simplify right side
    899.86x = 684,246.29
  5. Step 5: Solve for x
    x = 684,246.29/899.86
  6. Step 6: Final answer
    x = 760.39

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Half scale
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Double scale
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1.5x scale

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.