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Finding the Fourth Proportional to 709,413.12, 979,011 and 387,144.09

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Solution

The fourth proportional to 709,413.12, 979,011 and 387,144.09 is: 534,270.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,413.12 : 979,011 = 387,144.09 : x
  2. Step 2: Convert to fraction form
    709,413.12/979,011 = 387,144.09/x
  3. Step 3: Cross multiply
    709,413.12x = 979,011 × 387,144.09
  4. Step 4: Simplify right side
    709,413.12x = 379,018,322,694.99
  5. Step 5: Solve for x
    x = 379,018,322,694.99/709,413.12
  6. Step 6: Final answer
    x = 534,270.25

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.