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Finding the Fourth Proportional to 945.61, 1,303.89 and 613.60

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Solution

The fourth proportional to 945.61, 1,303.89 and 613.60 is: 846.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    945.61 : 1,303.89 = 613.60 : x
  2. Step 2: Convert to fraction form
    945.61/1,303.89 = 613.60/x
  3. Step 3: Cross multiply
    945.61x = 1,303.89 × 613.60
  4. Step 4: Simplify right side
    945.61x = 800,066.90
  5. Step 5: Solve for x
    x = 800,066.90/945.61
  6. Step 6: Final answer
    x = 846.09

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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.