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Finding the Fourth Proportional to 955.02, 1,316.64 and 640.35

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Solution

The fourth proportional to 955.02, 1,316.64 and 640.35 is: 882.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.02 : 1,316.64 = 640.35 : x
  2. Step 2: Convert to fraction form
    955.02/1,316.64 = 640.35/x
  3. Step 3: Cross multiply
    955.02x = 1,316.64 × 640.35
  4. Step 4: Simplify right side
    955.02x = 843,110.42
  5. Step 5: Solve for x
    x = 843,110.42/955.02
  6. Step 6: Final answer
    x = 882.82

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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.