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Finding the Fourth Proportional to 1,038.41, 1,432.94 and 618.80

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Solution

The fourth proportional to 1,038.41, 1,432.94 and 618.80 is: 853.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.41 : 1,432.94 = 618.80 : x
  2. Step 2: Convert to fraction form
    1,038.41/1,432.94 = 618.80/x
  3. Step 3: Cross multiply
    1,038.41x = 1,432.94 × 618.80
  4. Step 4: Simplify right side
    1,038.41x = 886,703.27
  5. Step 5: Solve for x
    x = 886,703.27/1,038.41
  6. Step 6: Final answer
    x = 853.90

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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.