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Finding the Fourth Proportional to 877.02, 1,208.70 and 628.35

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Solution

The fourth proportional to 877.02, 1,208.70 and 628.35 is: 865.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.02 : 1,208.70 = 628.35 : x
  2. Step 2: Convert to fraction form
    877.02/1,208.70 = 628.35/x
  3. Step 3: Cross multiply
    877.02x = 1,208.70 × 628.35
  4. Step 4: Simplify right side
    877.02x = 759,486.65
  5. Step 5: Solve for x
    x = 759,486.65/877.02
  6. Step 6: Final answer
    x = 865.99

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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.