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Finding the Fourth Proportional to 3,078.40, 4,618.38 and 887.32

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Solution

The fourth proportional to 3,078.40, 4,618.38 and 887.32 is: 1,331.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,078.40 : 4,618.38 = 887.32 : x
  2. Step 2: Convert to fraction form
    3,078.40/4,618.38 = 887.32/x
  3. Step 3: Cross multiply
    3,078.40x = 4,618.38 × 887.32
  4. Step 4: Simplify right side
    3,078.40x = 4,097,980.94
  5. Step 5: Solve for x
    x = 4,097,980.94/3,078.40
  6. Step 6: Final answer
    x = 1,331.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.