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Finding the Fourth Proportional to 784.10, 1,174.28 and 436.57

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Solution

The fourth proportional to 784.10, 1,174.28 and 436.57 is: 653.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.10 : 1,174.28 = 436.57 : x
  2. Step 2: Convert to fraction form
    784.10/1,174.28 = 436.57/x
  3. Step 3: Cross multiply
    784.10x = 1,174.28 × 436.57
  4. Step 4: Simplify right side
    784.10x = 512,653.24
  5. Step 5: Solve for x
    x = 512,653.24/784.10
  6. Step 6: Final answer
    x = 653.81

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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.