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Finding the Fourth Proportional to 1,438.22, 1,985.31 and 907.07

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Solution

The fourth proportional to 1,438.22, 1,985.31 and 907.07 is: 1,252.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.22 : 1,985.31 = 907.07 : x
  2. Step 2: Convert to fraction form
    1,438.22/1,985.31 = 907.07/x
  3. Step 3: Cross multiply
    1,438.22x = 1,985.31 × 907.07
  4. Step 4: Simplify right side
    1,438.22x = 1,800,805.22
  5. Step 5: Solve for x
    x = 1,800,805.22/1,438.22
  6. Step 6: Final answer
    x = 1,252.10

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1.5x scale

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.