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Finding the Fourth Proportional to 1,279.93, 1,765.28 and 860.00

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Solution

The fourth proportional to 1,279.93, 1,765.28 and 860.00 is: 1,186.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.93 : 1,765.28 = 860.00 : x
  2. Step 2: Convert to fraction form
    1,279.93/1,765.28 = 860.00/x
  3. Step 3: Cross multiply
    1,279.93x = 1,765.28 × 860.00
  4. Step 4: Simplify right side
    1,279.93x = 1,518,127.67
  5. Step 5: Solve for x
    x = 1,518,127.67/1,279.93
  6. Step 6: Final answer
    x = 1,186.10

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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.