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Finding the Fourth Proportional to 768.51, 1,060.55 and 419.20

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Solution

The fourth proportional to 768.51, 1,060.55 and 419.20 is: 578.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.51 : 1,060.55 = 419.20 : x
  2. Step 2: Convert to fraction form
    768.51/1,060.55 = 419.20/x
  3. Step 3: Cross multiply
    768.51x = 1,060.55 × 419.20
  4. Step 4: Simplify right side
    768.51x = 444,577.81
  5. Step 5: Solve for x
    x = 444,577.81/768.51
  6. Step 6: Final answer
    x = 578.49

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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.