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Finding the Fourth Proportional to 620,470.40, 856,329.76 and 378,702.72

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Solution

The fourth proportional to 620,470.40, 856,329.76 and 378,702.72 is: 522,658.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,470.40 : 856,329.76 = 378,702.72 : x
  2. Step 2: Convert to fraction form
    620,470.40/856,329.76 = 378,702.72/x
  3. Step 3: Cross multiply
    620,470.40x = 856,329.76 × 378,702.72
  4. Step 4: Simplify right side
    620,470.40x = 324,294,409,328.95
  5. Step 5: Solve for x
    x = 324,294,409,328.95/620,470.40
  6. Step 6: Final answer
    x = 522,658.95

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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.