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Finding the Fourth Proportional to 879,978.50, 1,319,990.54 and 280,939.16

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Solution

The fourth proportional to 879,978.50, 1,319,990.54 and 280,939.16 is: 421,416.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    879,978.50 : 1,319,990.54 = 280,939.16 : x
  2. Step 2: Convert to fraction form
    879,978.50/1,319,990.54 = 280,939.16/x
  3. Step 3: Cross multiply
    879,978.50x = 1,319,990.54 × 280,939.16
  4. Step 4: Simplify right side
    879,978.50x = 370,837,033,515.55
  5. Step 5: Solve for x
    x = 370,837,033,515.55/879,978.50
  6. Step 6: Final answer
    x = 421,416.02

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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.