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Finding the Fourth Proportional to 393,138, 542,530.80 and 214,290

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Solution

The fourth proportional to 393,138, 542,530.80 and 214,290 is: 295,720.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,138 : 542,530.80 = 214,290 : x
  2. Step 2: Convert to fraction form
    393,138/542,530.80 = 214,290/x
  3. Step 3: Cross multiply
    393,138x = 542,530.80 × 214,290
  4. Step 4: Simplify right side
    393,138x = 116,258,925,132.00
  5. Step 5: Solve for x
    x = 116,258,925,132.00/393,138
  6. Step 6: Final answer
    x = 295,720.40

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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.