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Finding the Fourth Proportional to 640.13, 960.69 and 571.77

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Solution

The fourth proportional to 640.13, 960.69 and 571.77 is: 858.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.13 : 960.69 = 571.77 : x
  2. Step 2: Convert to fraction form
    640.13/960.69 = 571.77/x
  3. Step 3: Cross multiply
    640.13x = 960.69 × 571.77
  4. Step 4: Simplify right side
    640.13x = 549,293.72
  5. Step 5: Solve for x
    x = 549,293.72/640.13
  6. Step 6: Final answer
    x = 858.10

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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.