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Finding the Fourth Proportional to 755.10, 1,130.85 and 429.84

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Solution

The fourth proportional to 755.10, 1,130.85 and 429.84 is: 643.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.10 : 1,130.85 = 429.84 : x
  2. Step 2: Convert to fraction form
    755.10/1,130.85 = 429.84/x
  3. Step 3: Cross multiply
    755.10x = 1,130.85 × 429.84
  4. Step 4: Simplify right side
    755.10x = 486,084.56
  5. Step 5: Solve for x
    x = 486,084.56/755.10
  6. Step 6: Final answer
    x = 643.74

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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.