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Finding the Fourth Proportional to 258,978,280.40, 388,467,420.60 and 258,978,280.40

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Solution

The fourth proportional to 258,978,280.40, 388,467,420.60 and 258,978,280.40 is: 388,467,420.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,978,280.40 : 388,467,420.60 = 258,978,280.40 : x
  2. Step 2: Convert to fraction form
    258,978,280.40/388,467,420.60 = 258,978,280.40/x
  3. Step 3: Cross multiply
    258,978,280.40x = 388,467,420.60 × 258,978,280.40
  4. Step 4: Simplify right side
    258,978,280.40x = 100,604,624,578,411,552
  5. Step 5: Solve for x
    x = 100,604,624,578,411,552/258,978,280.40
  6. Step 6: Final answer
    x = 388,467,420.60

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1.5x scale

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.