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Finding the Fourth Proportional to 628.61, 939.20 and 607.08

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Solution

The fourth proportional to 628.61, 939.20 and 607.08 is: 907.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.61 : 939.20 = 607.08 : x
  2. Step 2: Convert to fraction form
    628.61/939.20 = 607.08/x
  3. Step 3: Cross multiply
    628.61x = 939.20 × 607.08
  4. Step 4: Simplify right side
    628.61x = 570,168.21
  5. Step 5: Solve for x
    x = 570,168.21/628.61
  6. Step 6: Final answer
    x = 907.03

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.