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Finding the Fourth Proportional to 873.60, 1,310.40 and 386.54

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Solution

The fourth proportional to 873.60, 1,310.40 and 386.54 is: 579.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.60 : 1,310.40 = 386.54 : x
  2. Step 2: Convert to fraction form
    873.60/1,310.40 = 386.54/x
  3. Step 3: Cross multiply
    873.60x = 1,310.40 × 386.54
  4. Step 4: Simplify right side
    873.60x = 506,522.02
  5. Step 5: Solve for x
    x = 506,522.02/873.60
  6. Step 6: Final answer
    x = 579.81

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Double scale
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Similar ratio
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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.