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Finding the Fourth Proportional to 1,353.07, 2,029.49 and 428.49

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Solution

The fourth proportional to 1,353.07, 2,029.49 and 428.49 is: 642.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,353.07 : 2,029.49 = 428.49 : x
  2. Step 2: Convert to fraction form
    1,353.07/2,029.49 = 428.49/x
  3. Step 3: Cross multiply
    1,353.07x = 2,029.49 × 428.49
  4. Step 4: Simplify right side
    1,353.07x = 869,621.24
  5. Step 5: Solve for x
    x = 869,621.24/1,353.07
  6. Step 6: Final answer
    x = 642.70

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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.