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Finding the Fourth Proportional to 645.14, 889.62 and 607.94

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Solution

The fourth proportional to 645.14, 889.62 and 607.94 is: 838.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.14 : 889.62 = 607.94 : x
  2. Step 2: Convert to fraction form
    645.14/889.62 = 607.94/x
  3. Step 3: Cross multiply
    645.14x = 889.62 × 607.94
  4. Step 4: Simplify right side
    645.14x = 540,835.58
  5. Step 5: Solve for x
    x = 540,835.58/645.14
  6. Step 6: Final answer
    x = 838.32

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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.