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Finding the Fourth Proportional to 7,059.28, 9,742.38 and 3,915.40

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Solution

The fourth proportional to 7,059.28, 9,742.38 and 3,915.40 is: 5,403.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,059.28 : 9,742.38 = 3,915.40 : x
  2. Step 2: Convert to fraction form
    7,059.28/9,742.38 = 3,915.40/x
  3. Step 3: Cross multiply
    7,059.28x = 9,742.38 × 3,915.40
  4. Step 4: Simplify right side
    7,059.28x = 38,145,314.65
  5. Step 5: Solve for x
    x = 38,145,314.65/7,059.28
  6. Step 6: Final answer
    x = 5,403.57

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1.5x scale

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.