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Finding the Fourth Proportional to 421,637.80, 632,802.30 and 407,813.80

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Solution

The fourth proportional to 421,637.80, 632,802.30 and 407,813.80 is: 612,054.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,637.80 : 632,802.30 = 407,813.80 : x
  2. Step 2: Convert to fraction form
    421,637.80/632,802.30 = 407,813.80/x
  3. Step 3: Cross multiply
    421,637.80x = 632,802.30 × 407,813.80
  4. Step 4: Simplify right side
    421,637.80x = 258,065,510,611.74
  5. Step 5: Solve for x
    x = 258,065,510,611.74/421,637.80
  6. Step 6: Final answer
    x = 612,054.97

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.