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Finding the Fourth Proportional to 9,728.14, 13,425.48 and 5,421.90

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Solution

The fourth proportional to 9,728.14, 13,425.48 and 5,421.90 is: 7,482.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,728.14 : 13,425.48 = 5,421.90 : x
  2. Step 2: Convert to fraction form
    9,728.14/13,425.48 = 5,421.90/x
  3. Step 3: Cross multiply
    9,728.14x = 13,425.48 × 5,421.90
  4. Step 4: Simplify right side
    9,728.14x = 72,791,626.59
  5. Step 5: Solve for x
    x = 72,791,626.59/9,728.14
  6. Step 6: Final answer
    x = 7,482.59

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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.