Home / 6,420.47-9,631.58-3,131.28

Finding the Fourth Proportional to 6,420.47, 9,631.58 and 3,131.28

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Solution

The fourth proportional to 6,420.47, 9,631.58 and 3,131.28 is: 4,697.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,420.47 : 9,631.58 = 3,131.28 : x
  2. Step 2: Convert to fraction form
    6,420.47/9,631.58 = 3,131.28/x
  3. Step 3: Cross multiply
    6,420.47x = 9,631.58 × 3,131.28
  4. Step 4: Simplify right side
    6,420.47x = 30,159,158.17
  5. Step 5: Solve for x
    x = 30,159,158.17/6,420.47
  6. Step 6: Final answer
    x = 4,697.35

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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.