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Finding the Fourth Proportional to 641.18, 885.08 and 553.02

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Solution

The fourth proportional to 641.18, 885.08 and 553.02 is: 763.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.18 : 885.08 = 553.02 : x
  2. Step 2: Convert to fraction form
    641.18/885.08 = 553.02/x
  3. Step 3: Cross multiply
    641.18x = 885.08 × 553.02
  4. Step 4: Simplify right side
    641.18x = 489,466.94
  5. Step 5: Solve for x
    x = 489,466.94/641.18
  6. Step 6: Final answer
    x = 763.38

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Half scale
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Double scale
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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.