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Finding the Fourth Proportional to 661,525.20, 991,035.74 and 390,843.86

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Solution

The fourth proportional to 661,525.20, 991,035.74 and 390,843.86 is: 585,526.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,525.20 : 991,035.74 = 390,843.86 : x
  2. Step 2: Convert to fraction form
    661,525.20/991,035.74 = 390,843.86/x
  3. Step 3: Cross multiply
    661,525.20x = 991,035.74 × 390,843.86
  4. Step 4: Simplify right side
    661,525.20x = 387,340,230,041.49
  5. Step 5: Solve for x
    x = 387,340,230,041.49/661,525.20
  6. Step 6: Final answer
    x = 585,526.04

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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.