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Finding the Fourth Proportional to 1,438.40, 1,985.22 and 907.64

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Solution

The fourth proportional to 1,438.40, 1,985.22 and 907.64 is: 1,252.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.40 : 1,985.22 = 907.64 : x
  2. Step 2: Convert to fraction form
    1,438.40/1,985.22 = 907.64/x
  3. Step 3: Cross multiply
    1,438.40x = 1,985.22 × 907.64
  4. Step 4: Simplify right side
    1,438.40x = 1,801,865.08
  5. Step 5: Solve for x
    x = 1,801,865.08/1,438.40
  6. Step 6: Final answer
    x = 1,252.69

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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.