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Finding the Fourth Proportional to 2,905.40, 4,358.80 and 853.40

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Solution

The fourth proportional to 2,905.40, 4,358.80 and 853.40 is: 1,280.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,905.40 : 4,358.80 = 853.40 : x
  2. Step 2: Convert to fraction form
    2,905.40/4,358.80 = 853.40/x
  3. Step 3: Cross multiply
    2,905.40x = 4,358.80 × 853.40
  4. Step 4: Simplify right side
    2,905.40x = 3,719,799.92
  5. Step 5: Solve for x
    x = 3,719,799.92/2,905.40
  6. Step 6: Final answer
    x = 1,280.31

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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.