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Finding the Fourth Proportional to 2,854.05, 4,280.64 and 906

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Solution

The fourth proportional to 2,854.05, 4,280.64 and 906 is: 1,358.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,854.05 : 4,280.64 = 906 : x
  2. Step 2: Convert to fraction form
    2,854.05/4,280.64 = 906/x
  3. Step 3: Cross multiply
    2,854.05x = 4,280.64 × 906
  4. Step 4: Simplify right side
    2,854.05x = 3,878,259.84
  5. Step 5: Solve for x
    x = 3,878,259.84/2,854.05
  6. Step 6: Final answer
    x = 1,358.86

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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.