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Finding the Fourth Proportional to 644.88, 890.16 and 465.60

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Solution

The fourth proportional to 644.88, 890.16 and 465.60 is: 642.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.88 : 890.16 = 465.60 : x
  2. Step 2: Convert to fraction form
    644.88/890.16 = 465.60/x
  3. Step 3: Cross multiply
    644.88x = 890.16 × 465.60
  4. Step 4: Simplify right side
    644.88x = 414,458.50
  5. Step 5: Solve for x
    x = 414,458.50/644.88
  6. Step 6: Final answer
    x = 642.69

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1.5x scale

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.