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Finding the Fourth Proportional to 813.77, 1,218.58 and 448.16

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Solution

The fourth proportional to 813.77, 1,218.58 and 448.16 is: 671.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.77 : 1,218.58 = 448.16 : x
  2. Step 2: Convert to fraction form
    813.77/1,218.58 = 448.16/x
  3. Step 3: Cross multiply
    813.77x = 1,218.58 × 448.16
  4. Step 4: Simplify right side
    813.77x = 546,111.60
  5. Step 5: Solve for x
    x = 546,111.60/813.77
  6. Step 6: Final answer
    x = 671.09

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.