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Finding the Fourth Proportional to 302,940.70, 455,395.20 and 259,638.10

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Solution

The fourth proportional to 302,940.70, 455,395.20 and 259,638.10 is: 390,300.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    302,940.70 : 455,395.20 = 259,638.10 : x
  2. Step 2: Convert to fraction form
    302,940.70/455,395.20 = 259,638.10/x
  3. Step 3: Cross multiply
    302,940.70x = 455,395.20 × 259,638.10
  4. Step 4: Simplify right side
    302,940.70x = 118,237,944,477.12
  5. Step 5: Solve for x
    x = 118,237,944,477.12/302,940.70
  6. Step 6: Final answer
    x = 390,300.62

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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.