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Finding the Fourth Proportional to 853.81, 1,280.71 and 528.19

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Solution

The fourth proportional to 853.81, 1,280.71 and 528.19 is: 792.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.81 : 1,280.71 = 528.19 : x
  2. Step 2: Convert to fraction form
    853.81/1,280.71 = 528.19/x
  3. Step 3: Cross multiply
    853.81x = 1,280.71 × 528.19
  4. Step 4: Simplify right side
    853.81x = 676,455.67
  5. Step 5: Solve for x
    x = 676,455.67/853.81
  6. Step 6: Final answer
    x = 792.28

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Double scale
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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.