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Finding the Fourth Proportional to 451,688.85, 621,765.81 and 390,406.95

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Solution

The fourth proportional to 451,688.85, 621,765.81 and 390,406.95 is: 537,409.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    451,688.85 : 621,765.81 = 390,406.95 : x
  2. Step 2: Convert to fraction form
    451,688.85/621,765.81 = 390,406.95/x
  3. Step 3: Cross multiply
    451,688.85x = 621,765.81 × 390,406.95
  4. Step 4: Simplify right side
    451,688.85x = 242,741,693,496.38
  5. Step 5: Solve for x
    x = 242,741,693,496.38/451,688.85
  6. Step 6: Final answer
    x = 537,409.09

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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.