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Finding the Fourth Proportional to 203,438.70, 305,071.65 and 98,289.90

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Solution

The fourth proportional to 203,438.70, 305,071.65 and 98,289.90 is: 147,393.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    203,438.70 : 305,071.65 = 98,289.90 : x
  2. Step 2: Convert to fraction form
    203,438.70/305,071.65 = 98,289.90/x
  3. Step 3: Cross multiply
    203,438.70x = 305,071.65 × 98,289.90
  4. Step 4: Simplify right side
    203,438.70x = 29,985,461,971.34
  5. Step 5: Solve for x
    x = 29,985,461,971.34/203,438.70
  6. Step 6: Final answer
    x = 147,393.11

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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.