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Finding the Fourth Proportional to 661,556.34, 991,082.43 and 390,874.98

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Solution

The fourth proportional to 661,556.34, 991,082.43 and 390,874.98 is: 585,572.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,556.34 : 991,082.43 = 390,874.98 : x
  2. Step 2: Convert to fraction form
    661,556.34/991,082.43 = 390,874.98/x
  3. Step 3: Cross multiply
    661,556.34x = 991,082.43 × 390,874.98
  4. Step 4: Simplify right side
    661,556.34x = 387,389,325,004.60
  5. Step 5: Solve for x
    x = 387,389,325,004.60/661,556.34
  6. Step 6: Final answer
    x = 585,572.69

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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.