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Finding the Fourth Proportional to 637.60, 878.76 and 490

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Solution

The fourth proportional to 637.60, 878.76 and 490 is: 675.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    637.60 : 878.76 = 490 : x
  2. Step 2: Convert to fraction form
    637.60/878.76 = 490/x
  3. Step 3: Cross multiply
    637.60x = 878.76 × 490
  4. Step 4: Simplify right side
    637.60x = 430,592.40
  5. Step 5: Solve for x
    x = 430,592.40/637.60
  6. Step 6: Final answer
    x = 675.33

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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.