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Finding the Fourth Proportional to 1,438.95, 2,156.60 and 616.40

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Solution

The fourth proportional to 1,438.95, 2,156.60 and 616.40 is: 923.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.95 : 2,156.60 = 616.40 : x
  2. Step 2: Convert to fraction form
    1,438.95/2,156.60 = 616.40/x
  3. Step 3: Cross multiply
    1,438.95x = 2,156.60 × 616.40
  4. Step 4: Simplify right side
    1,438.95x = 1,329,328.24
  5. Step 5: Solve for x
    x = 1,329,328.24/1,438.95
  6. Step 6: Final answer
    x = 923.82

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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.