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Finding the Fourth Proportional to 388,990.40, 583,485.60 and 212,043.20

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Solution

The fourth proportional to 388,990.40, 583,485.60 and 212,043.20 is: 318,064.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,990.40 : 583,485.60 = 212,043.20 : x
  2. Step 2: Convert to fraction form
    388,990.40/583,485.60 = 212,043.20/x
  3. Step 3: Cross multiply
    388,990.40x = 583,485.60 × 212,043.20
  4. Step 4: Simplify right side
    388,990.40x = 123,724,153,777.92
  5. Step 5: Solve for x
    x = 123,724,153,777.92/388,990.40
  6. Step 6: Final answer
    x = 318,064.80

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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.