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Finding the Fourth Proportional to 451,679.85, 621,753.39 and 390,397.95

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Solution

The fourth proportional to 451,679.85, 621,753.39 and 390,397.95 is: 537,396.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    451,679.85 : 621,753.39 = 390,397.95 : x
  2. Step 2: Convert to fraction form
    451,679.85/621,753.39 = 390,397.95/x
  3. Step 3: Cross multiply
    451,679.85x = 621,753.39 × 390,397.95
  4. Step 4: Simplify right side
    451,679.85x = 242,731,248,861.55
  5. Step 5: Solve for x
    x = 242,731,248,861.55/451,679.85
  6. Step 6: Final answer
    x = 537,396.67

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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.