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Finding the Fourth Proportional to 1,404.54, 2,106.81 and 430.64

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Solution

The fourth proportional to 1,404.54, 2,106.81 and 430.64 is: 645.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,404.54 : 2,106.81 = 430.64 : x
  2. Step 2: Convert to fraction form
    1,404.54/2,106.81 = 430.64/x
  3. Step 3: Cross multiply
    1,404.54x = 2,106.81 × 430.64
  4. Step 4: Simplify right side
    1,404.54x = 907,266.12
  5. Step 5: Solve for x
    x = 907,266.12/1,404.54
  6. Step 6: Final answer
    x = 645.95

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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.