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Finding the Fourth Proportional to 948.99, 1,310 and 638.67

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Solution

The fourth proportional to 948.99, 1,310 and 638.67 is: 881.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.99 : 1,310 = 638.67 : x
  2. Step 2: Convert to fraction form
    948.99/1,310 = 638.67/x
  3. Step 3: Cross multiply
    948.99x = 1,310 × 638.67
  4. Step 4: Simplify right side
    948.99x = 836,657.70
  5. Step 5: Solve for x
    x = 836,657.70/948.99
  6. Step 6: Final answer
    x = 881.63

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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.