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Finding the Fourth Proportional to 641.07, 885.58 and 495.57

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Solution

The fourth proportional to 641.07, 885.58 and 495.57 is: 684.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.07 : 885.58 = 495.57 : x
  2. Step 2: Convert to fraction form
    641.07/885.58 = 495.57/x
  3. Step 3: Cross multiply
    641.07x = 885.58 × 495.57
  4. Step 4: Simplify right side
    641.07x = 438,866.88
  5. Step 5: Solve for x
    x = 438,866.88/641.07
  6. Step 6: Final answer
    x = 684.58

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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.