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Finding the Fourth Proportional to 1,283.77, 1,771.20 and 785.89

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Solution

The fourth proportional to 1,283.77, 1,771.20 and 785.89 is: 1,084.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,283.77 : 1,771.20 = 785.89 : x
  2. Step 2: Convert to fraction form
    1,283.77/1,771.20 = 785.89/x
  3. Step 3: Cross multiply
    1,283.77x = 1,771.20 × 785.89
  4. Step 4: Simplify right side
    1,283.77x = 1,391,968.37
  5. Step 5: Solve for x
    x = 1,391,968.37/1,283.77
  6. Step 6: Final answer
    x = 1,084.28

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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.