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Finding the Fourth Proportional to 623,405.80, 860,309.22 and 355,128.04

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Solution

The fourth proportional to 623,405.80, 860,309.22 and 355,128.04 is: 490,081.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    623,405.80 : 860,309.22 = 355,128.04 : x
  2. Step 2: Convert to fraction form
    623,405.80/860,309.22 = 355,128.04/x
  3. Step 3: Cross multiply
    623,405.80x = 860,309.22 × 355,128.04
  4. Step 4: Simplify right side
    623,405.80x = 305,519,927,092.53
  5. Step 5: Solve for x
    x = 305,519,927,092.53/623,405.80
  6. Step 6: Final answer
    x = 490,081.95

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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.