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Finding the Fourth Proportional to 640.44, 880.74 and 509.22

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Solution

The fourth proportional to 640.44, 880.74 and 509.22 is: 700.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.44 : 880.74 = 509.22 : x
  2. Step 2: Convert to fraction form
    640.44/880.74 = 509.22/x
  3. Step 3: Cross multiply
    640.44x = 880.74 × 509.22
  4. Step 4: Simplify right side
    640.44x = 448,490.42
  5. Step 5: Solve for x
    x = 448,490.42/640.44
  6. Step 6: Final answer
    x = 700.28

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.