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Finding the Fourth Proportional to 1,260.72, 1,739.04 and 930

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Solution

The fourth proportional to 1,260.72, 1,739.04 and 930 is: 1,282.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,260.72 : 1,739.04 = 930 : x
  2. Step 2: Convert to fraction form
    1,260.72/1,739.04 = 930/x
  3. Step 3: Cross multiply
    1,260.72x = 1,739.04 × 930
  4. Step 4: Simplify right side
    1,260.72x = 1,617,307.20
  5. Step 5: Solve for x
    x = 1,617,307.20/1,260.72
  6. Step 6: Final answer
    x = 1,282.84

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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.