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Finding the Fourth Proportional to 451,682.35, 621,756.84 and 390,400.45

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Solution

The fourth proportional to 451,682.35, 621,756.84 and 390,400.45 is: 537,400.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    451,682.35 : 621,756.84 = 390,400.45 : x
  2. Step 2: Convert to fraction form
    451,682.35/621,756.84 = 390,400.45/x
  3. Step 3: Cross multiply
    451,682.35x = 621,756.84 × 390,400.45
  4. Step 4: Simplify right side
    451,682.35x = 242,734,150,126.58
  5. Step 5: Solve for x
    x = 242,734,150,126.58/451,682.35
  6. Step 6: Final answer
    x = 537,400.12

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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.