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Finding the Fourth Proportional to 388,894.91, 583,331.36 and 212,518.89

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Solution

The fourth proportional to 388,894.91, 583,331.36 and 212,518.89 is: 318,772.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,894.91 : 583,331.36 = 212,518.89 : x
  2. Step 2: Convert to fraction form
    388,894.91/583,331.36 = 212,518.89/x
  3. Step 3: Cross multiply
    388,894.91x = 583,331.36 × 212,518.89
  4. Step 4: Simplify right side
    388,894.91x = 123,968,932,066.80
  5. Step 5: Solve for x
    x = 123,968,932,066.80/388,894.91
  6. Step 6: Final answer
    x = 318,772.32

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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.