Home / 1,038.60-1,432.89-928.44

Finding the Fourth Proportional to 1,038.60, 1,432.89 and 928.44

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Solution

The fourth proportional to 1,038.60, 1,432.89 and 928.44 is: 1,280.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.60 : 1,432.89 = 928.44 : x
  2. Step 2: Convert to fraction form
    1,038.60/1,432.89 = 928.44/x
  3. Step 3: Cross multiply
    1,038.60x = 1,432.89 × 928.44
  4. Step 4: Simplify right side
    1,038.60x = 1,330,352.39
  5. Step 5: Solve for x
    x = 1,330,352.39/1,038.60
  6. Step 6: Final answer
    x = 1,280.91

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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.