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Finding the Fourth Proportional to 286,258.48, 394,386.88 and 221,505.08

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Solution

The fourth proportional to 286,258.48, 394,386.88 and 221,505.08 is: 305,174.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    286,258.48 : 394,386.88 = 221,505.08 : x
  2. Step 2: Convert to fraction form
    286,258.48/394,386.88 = 221,505.08/x
  3. Step 3: Cross multiply
    286,258.48x = 394,386.88 × 221,505.08
  4. Step 4: Simplify right side
    286,258.48x = 87,358,697,405.35
  5. Step 5: Solve for x
    x = 87,358,697,405.35/286,258.48
  6. Step 6: Final answer
    x = 305,174.18

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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.