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Finding the Fourth Proportional to 645.06, 889.95 and 424.13

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Solution

The fourth proportional to 645.06, 889.95 and 424.13 is: 585.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.06 : 889.95 = 424.13 : x
  2. Step 2: Convert to fraction form
    645.06/889.95 = 424.13/x
  3. Step 3: Cross multiply
    645.06x = 889.95 × 424.13
  4. Step 4: Simplify right side
    645.06x = 377,454.49
  5. Step 5: Solve for x
    x = 377,454.49/645.06
  6. Step 6: Final answer
    x = 585.15

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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.