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Finding the Fourth Proportional to 5,138, 7,708.28 and 1,490

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Solution

The fourth proportional to 5,138, 7,708.28 and 1,490 is: 2,235.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,138 : 7,708.28 = 1,490 : x
  2. Step 2: Convert to fraction form
    5,138/7,708.28 = 1,490/x
  3. Step 3: Cross multiply
    5,138x = 7,708.28 × 1,490
  4. Step 4: Simplify right side
    5,138x = 11,485,337.20
  5. Step 5: Solve for x
    x = 11,485,337.20/5,138
  6. Step 6: Final answer
    x = 2,235.37

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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.