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Finding the Fourth Proportional to 1,438.46, 2,156.32 and 916.99

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Solution

The fourth proportional to 1,438.46, 2,156.32 and 916.99 is: 1,374.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.46 : 2,156.32 = 916.99 : x
  2. Step 2: Convert to fraction form
    1,438.46/2,156.32 = 916.99/x
  3. Step 3: Cross multiply
    1,438.46x = 2,156.32 × 916.99
  4. Step 4: Simplify right side
    1,438.46x = 1,977,326.98
  5. Step 5: Solve for x
    x = 1,977,326.98/1,438.46
  6. Step 6: Final answer
    x = 1,374.62

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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.