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Finding the Fourth Proportional to 1,404.65, 2,106.89 and 430.75

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Solution

The fourth proportional to 1,404.65, 2,106.89 and 430.75 is: 646.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,404.65 : 2,106.89 = 430.75 : x
  2. Step 2: Convert to fraction form
    1,404.65/2,106.89 = 430.75/x
  3. Step 3: Cross multiply
    1,404.65x = 2,106.89 × 430.75
  4. Step 4: Simplify right side
    1,404.65x = 907,542.87
  5. Step 5: Solve for x
    x = 907,542.87/1,404.65
  6. Step 6: Final answer
    x = 646.10

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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.