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Finding the Fourth Proportional to 953.70, 1,315.60 and 638.61

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Solution

The fourth proportional to 953.70, 1,315.60 and 638.61 is: 880.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    953.70 : 1,315.60 = 638.61 : x
  2. Step 2: Convert to fraction form
    953.70/1,315.60 = 638.61/x
  3. Step 3: Cross multiply
    953.70x = 1,315.60 × 638.61
  4. Step 4: Simplify right side
    953.70x = 840,155.32
  5. Step 5: Solve for x
    x = 840,155.32/953.70
  6. Step 6: Final answer
    x = 880.94

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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.