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Finding the Fourth Proportional to 1,258.21, 1,883.93 and 818.15

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Solution

The fourth proportional to 1,258.21, 1,883.93 and 818.15 is: 1,225.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,258.21 : 1,883.93 = 818.15 : x
  2. Step 2: Convert to fraction form
    1,258.21/1,883.93 = 818.15/x
  3. Step 3: Cross multiply
    1,258.21x = 1,883.93 × 818.15
  4. Step 4: Simplify right side
    1,258.21x = 1,541,341.32
  5. Step 5: Solve for x
    x = 1,541,341.32/1,258.21
  6. Step 6: Final answer
    x = 1,225.03

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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.