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Finding the Fourth Proportional to 640.42, 955.84 and 589.12

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Solution

The fourth proportional to 640.42, 955.84 and 589.12 is: 879.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.42 : 955.84 = 589.12 : x
  2. Step 2: Convert to fraction form
    640.42/955.84 = 589.12/x
  3. Step 3: Cross multiply
    640.42x = 955.84 × 589.12
  4. Step 4: Simplify right side
    640.42x = 563,104.46
  5. Step 5: Solve for x
    x = 563,104.46/640.42
  6. Step 6: Final answer
    x = 879.27

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.