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Finding the Fourth Proportional to 1,438.44, 1,985.06 and 840.66

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Solution

The fourth proportional to 1,438.44, 1,985.06 and 840.66 is: 1,160.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.44 : 1,985.06 = 840.66 : x
  2. Step 2: Convert to fraction form
    1,438.44/1,985.06 = 840.66/x
  3. Step 3: Cross multiply
    1,438.44x = 1,985.06 × 840.66
  4. Step 4: Simplify right side
    1,438.44x = 1,668,760.54
  5. Step 5: Solve for x
    x = 1,668,760.54/1,438.44
  6. Step 6: Final answer
    x = 1,160.12

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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.