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Finding the Fourth Proportional to 390,405.02, 538,771.85 and 215,977.64

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Solution

The fourth proportional to 390,405.02, 538,771.85 and 215,977.64 is: 298,056.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,405.02 : 538,771.85 = 215,977.64 : x
  2. Step 2: Convert to fraction form
    390,405.02/538,771.85 = 215,977.64/x
  3. Step 3: Cross multiply
    390,405.02x = 538,771.85 × 215,977.64
  4. Step 4: Simplify right side
    390,405.02x = 116,362,668,887.69
  5. Step 5: Solve for x
    x = 116,362,668,887.69/390,405.02
  6. Step 6: Final answer
    x = 298,056.29

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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.