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Finding the Fourth Proportional to 6,438.40, 9,657.60 and 5,142.40

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Solution

The fourth proportional to 6,438.40, 9,657.60 and 5,142.40 is: 7,713.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,438.40 : 9,657.60 = 5,142.40 : x
  2. Step 2: Convert to fraction form
    6,438.40/9,657.60 = 5,142.40/x
  3. Step 3: Cross multiply
    6,438.40x = 9,657.60 × 5,142.40
  4. Step 4: Simplify right side
    6,438.40x = 49,663,242.24
  5. Step 5: Solve for x
    x = 49,663,242.24/6,438.40
  6. Step 6: Final answer
    x = 7,713.60

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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.