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Finding the Fourth Proportional to 875.50, 1,207.36 and 628.04

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Solution

The fourth proportional to 875.50, 1,207.36 and 628.04 is: 866.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.50 : 1,207.36 = 628.04 : x
  2. Step 2: Convert to fraction form
    875.50/1,207.36 = 628.04/x
  3. Step 3: Cross multiply
    875.50x = 1,207.36 × 628.04
  4. Step 4: Simplify right side
    875.50x = 758,270.37
  5. Step 5: Solve for x
    x = 758,270.37/875.50
  6. Step 6: Final answer
    x = 866.10

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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.