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Finding the Fourth Proportional to 1,439.46, 1,985.94 and 942.75

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Solution

The fourth proportional to 1,439.46, 1,985.94 and 942.75 is: 1,300.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,439.46 : 1,985.94 = 942.75 : x
  2. Step 2: Convert to fraction form
    1,439.46/1,985.94 = 942.75/x
  3. Step 3: Cross multiply
    1,439.46x = 1,985.94 × 942.75
  4. Step 4: Simplify right side
    1,439.46x = 1,872,244.94
  5. Step 5: Solve for x
    x = 1,872,244.94/1,439.46
  6. Step 6: Final answer
    x = 1,300.66

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Double scale
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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.