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Finding the Fourth Proportional to 780.64, 1,074.08 and 675.39

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Solution

The fourth proportional to 780.64, 1,074.08 and 675.39 is: 929.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.64 : 1,074.08 = 675.39 : x
  2. Step 2: Convert to fraction form
    780.64/1,074.08 = 675.39/x
  3. Step 3: Cross multiply
    780.64x = 1,074.08 × 675.39
  4. Step 4: Simplify right side
    780.64x = 725,418.77
  5. Step 5: Solve for x
    x = 725,418.77/780.64
  6. Step 6: Final answer
    x = 929.26

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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.