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Finding the Fourth Proportional to 578,413.40, 867,620.10 and 379,987.80

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Solution

The fourth proportional to 578,413.40, 867,620.10 and 379,987.80 is: 569,981.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    578,413.40 : 867,620.10 = 379,987.80 : x
  2. Step 2: Convert to fraction form
    578,413.40/867,620.10 = 379,987.80/x
  3. Step 3: Cross multiply
    578,413.40x = 867,620.10 × 379,987.80
  4. Step 4: Simplify right side
    578,413.40x = 329,685,053,034.78
  5. Step 5: Solve for x
    x = 329,685,053,034.78/578,413.40
  6. Step 6: Final answer
    x = 569,981.70

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Double scale
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Similar ratio
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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.