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Finding the Fourth Proportional to 1,265.60, 1,898.38 and 388.10

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Solution

The fourth proportional to 1,265.60, 1,898.38 and 388.10 is: 582.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,265.60 : 1,898.38 = 388.10 : x
  2. Step 2: Convert to fraction form
    1,265.60/1,898.38 = 388.10/x
  3. Step 3: Cross multiply
    1,265.60x = 1,898.38 × 388.10
  4. Step 4: Simplify right side
    1,265.60x = 736,761.28
  5. Step 5: Solve for x
    x = 736,761.28/1,265.60
  6. Step 6: Final answer
    x = 582.14

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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.