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Finding the Fourth Proportional to 1,438.98, 2,156.85 and 707.01

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Solution

The fourth proportional to 1,438.98, 2,156.85 and 707.01 is: 1,059.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.98 : 2,156.85 = 707.01 : x
  2. Step 2: Convert to fraction form
    1,438.98/2,156.85 = 707.01/x
  3. Step 3: Cross multiply
    1,438.98x = 2,156.85 × 707.01
  4. Step 4: Simplify right side
    1,438.98x = 1,524,914.52
  5. Step 5: Solve for x
    x = 1,524,914.52/1,438.98
  6. Step 6: Final answer
    x = 1,059.72

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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.