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Finding the Fourth Proportional to 1,438.12, 2,156.72 and 464

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Solution

The fourth proportional to 1,438.12, 2,156.72 and 464 is: 695.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.12 : 2,156.72 = 464 : x
  2. Step 2: Convert to fraction form
    1,438.12/2,156.72 = 464/x
  3. Step 3: Cross multiply
    1,438.12x = 2,156.72 × 464
  4. Step 4: Simplify right side
    1,438.12x = 1,000,718.08
  5. Step 5: Solve for x
    x = 1,000,718.08/1,438.12
  6. Step 6: Final answer
    x = 695.85

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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.