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Finding the Fourth Proportional to 6,431.40, 8,875.44 and 3,913.11

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Solution

The fourth proportional to 6,431.40, 8,875.44 and 3,913.11 is: 5,400.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,431.40 : 8,875.44 = 3,913.11 : x
  2. Step 2: Convert to fraction form
    6,431.40/8,875.44 = 3,913.11/x
  3. Step 3: Cross multiply
    6,431.40x = 8,875.44 × 3,913.11
  4. Step 4: Simplify right side
    6,431.40x = 34,730,573.02
  5. Step 5: Solve for x
    x = 34,730,573.02/6,431.40
  6. Step 6: Final answer
    x = 5,400.16

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.