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Finding the Fourth Proportional to 1,406.75, 1,941.44 and 785.87

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Solution

The fourth proportional to 1,406.75, 1,941.44 and 785.87 is: 1,084.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,406.75 : 1,941.44 = 785.87 : x
  2. Step 2: Convert to fraction form
    1,406.75/1,941.44 = 785.87/x
  3. Step 3: Cross multiply
    1,406.75x = 1,941.44 × 785.87
  4. Step 4: Simplify right side
    1,406.75x = 1,525,715.52
  5. Step 5: Solve for x
    x = 1,525,715.52/1,406.75
  6. Step 6: Final answer
    x = 1,084.57

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Half scale
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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.