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Finding the Fourth Proportional to 953.87, 1,315.60 and 639.05

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Solution

The fourth proportional to 953.87, 1,315.60 and 639.05 is: 881.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    953.87 : 1,315.60 = 639.05 : x
  2. Step 2: Convert to fraction form
    953.87/1,315.60 = 639.05/x
  3. Step 3: Cross multiply
    953.87x = 1,315.60 × 639.05
  4. Step 4: Simplify right side
    953.87x = 840,726.00
  5. Step 5: Solve for x
    x = 840,726.00/953.87
  6. Step 6: Final answer
    x = 881.39

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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.