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Finding the Fourth Proportional to 68,431.40, 102,647.10 and 31,567.40

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Solution

The fourth proportional to 68,431.40, 102,647.10 and 31,567.40 is: 47,351.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,431.40 : 102,647.10 = 31,567.40 : x
  2. Step 2: Convert to fraction form
    68,431.40/102,647.10 = 31,567.40/x
  3. Step 3: Cross multiply
    68,431.40x = 102,647.10 × 31,567.40
  4. Step 4: Simplify right side
    68,431.40x = 3,240,302,064.54
  5. Step 5: Solve for x
    x = 3,240,302,064.54/68,431.40
  6. Step 6: Final answer
    x = 47,351.10

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1.5x scale

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.