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Finding the Fourth Proportional to 1,404.36, 2,106.84 and 430.54

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Solution

The fourth proportional to 1,404.36, 2,106.84 and 430.54 is: 645.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,404.36 : 2,106.84 = 430.54 : x
  2. Step 2: Convert to fraction form
    1,404.36/2,106.84 = 430.54/x
  3. Step 3: Cross multiply
    1,404.36x = 2,106.84 × 430.54
  4. Step 4: Simplify right side
    1,404.36x = 907,068.36
  5. Step 5: Solve for x
    x = 907,068.36/1,404.36
  6. Step 6: Final answer
    x = 645.90

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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.