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Finding the Fourth Proportional to 388,990.20, 583,485.30 and 386,532.60

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Solution

The fourth proportional to 388,990.20, 583,485.30 and 386,532.60 is: 579,798.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,990.20 : 583,485.30 = 386,532.60 : x
  2. Step 2: Convert to fraction form
    388,990.20/583,485.30 = 386,532.60/x
  3. Step 3: Cross multiply
    388,990.20x = 583,485.30 × 386,532.60
  4. Step 4: Simplify right side
    388,990.20x = 225,536,090,070.78
  5. Step 5: Solve for x
    x = 225,536,090,070.78/388,990.20
  6. Step 6: Final answer
    x = 579,798.90

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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.