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Finding the Fourth Proportional to 405,525.60, 608,902.80 and 312,136.80

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Solution

The fourth proportional to 405,525.60, 608,902.80 and 312,136.80 is: 468,678.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,525.60 : 608,902.80 = 312,136.80 : x
  2. Step 2: Convert to fraction form
    405,525.60/608,902.80 = 312,136.80/x
  3. Step 3: Cross multiply
    405,525.60x = 608,902.80 × 312,136.80
  4. Step 4: Simplify right side
    405,525.60x = 190,060,971,503.04
  5. Step 5: Solve for x
    x = 190,060,971,503.04/405,525.60
  6. Step 6: Final answer
    x = 468,678.11

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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.