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Finding the Fourth Proportional to 6,389.40, 9,584.10 and 4,445.40

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Solution

The fourth proportional to 6,389.40, 9,584.10 and 4,445.40 is: 6,668.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,389.40 : 9,584.10 = 4,445.40 : x
  2. Step 2: Convert to fraction form
    6,389.40/9,584.10 = 4,445.40/x
  3. Step 3: Cross multiply
    6,389.40x = 9,584.10 × 4,445.40
  4. Step 4: Simplify right side
    6,389.40x = 42,605,158.14
  5. Step 5: Solve for x
    x = 42,605,158.14/6,389.40
  6. Step 6: Final answer
    x = 6,668.10

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Double scale
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Similar ratio
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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.