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Finding the Fourth Proportional to 1,021.62, 1,532.90 and 436.80

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Solution

The fourth proportional to 1,021.62, 1,532.90 and 436.80 is: 655.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.62 : 1,532.90 = 436.80 : x
  2. Step 2: Convert to fraction form
    1,021.62/1,532.90 = 436.80/x
  3. Step 3: Cross multiply
    1,021.62x = 1,532.90 × 436.80
  4. Step 4: Simplify right side
    1,021.62x = 669,571.81
  5. Step 5: Solve for x
    x = 669,571.81/1,021.62
  6. Step 6: Final answer
    x = 655.40

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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.