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Finding the Fourth Proportional to 390,615.72, 585,921.87 and 165,941.70

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Solution

The fourth proportional to 390,615.72, 585,921.87 and 165,941.70 is: 248,911.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,615.72 : 585,921.87 = 165,941.70 : x
  2. Step 2: Convert to fraction form
    390,615.72/585,921.87 = 165,941.70/x
  3. Step 3: Cross multiply
    390,615.72x = 585,921.87 × 165,941.70
  4. Step 4: Simplify right side
    390,615.72x = 97,228,871,174.98
  5. Step 5: Solve for x
    x = 97,228,871,174.98/390,615.72
  6. Step 6: Final answer
    x = 248,911.82

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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.