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Finding the Fourth Proportional to 741.36, 1,020.80 and 508.08

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Solution

The fourth proportional to 741.36, 1,020.80 and 508.08 is: 699.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    741.36 : 1,020.80 = 508.08 : x
  2. Step 2: Convert to fraction form
    741.36/1,020.80 = 508.08/x
  3. Step 3: Cross multiply
    741.36x = 1,020.80 × 508.08
  4. Step 4: Simplify right side
    741.36x = 518,648.06
  5. Step 5: Solve for x
    x = 518,648.06/741.36
  6. Step 6: Final answer
    x = 699.59

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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.