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Finding the Fourth Proportional to 913.08, 1,261.72 and 650.64

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Solution

The fourth proportional to 913.08, 1,261.72 and 650.64 is: 899.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.08 : 1,261.72 = 650.64 : x
  2. Step 2: Convert to fraction form
    913.08/1,261.72 = 650.64/x
  3. Step 3: Cross multiply
    913.08x = 1,261.72 × 650.64
  4. Step 4: Simplify right side
    913.08x = 820,925.50
  5. Step 5: Solve for x
    x = 820,925.50/913.08
  6. Step 6: Final answer
    x = 899.07

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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.