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Finding the Fourth Proportional to 3,420.63, 5,130.79 and 955.40

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Solution

The fourth proportional to 3,420.63, 5,130.79 and 955.40 is: 1,433.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,420.63 : 5,130.79 = 955.40 : x
  2. Step 2: Convert to fraction form
    3,420.63/5,130.79 = 955.40/x
  3. Step 3: Cross multiply
    3,420.63x = 5,130.79 × 955.40
  4. Step 4: Simplify right side
    3,420.63x = 4,901,956.77
  5. Step 5: Solve for x
    x = 4,901,956.77/3,420.63
  6. Step 6: Final answer
    x = 1,433.06

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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.