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Finding the Fourth Proportional to 883.76, 1,219.98 and 636.32

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Solution

The fourth proportional to 883.76, 1,219.98 and 636.32 is: 878.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    883.76 : 1,219.98 = 636.32 : x
  2. Step 2: Convert to fraction form
    883.76/1,219.98 = 636.32/x
  3. Step 3: Cross multiply
    883.76x = 1,219.98 × 636.32
  4. Step 4: Simplify right side
    883.76x = 776,297.67
  5. Step 5: Solve for x
    x = 776,297.67/883.76
  6. Step 6: Final answer
    x = 878.40

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1.5x scale

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.