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Finding the Fourth Proportional to 865,319.20, 1,297,978.80 and 492,071.20

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Solution

The fourth proportional to 865,319.20, 1,297,978.80 and 492,071.20 is: 738,106.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    865,319.20 : 1,297,978.80 = 492,071.20 : x
  2. Step 2: Convert to fraction form
    865,319.20/1,297,978.80 = 492,071.20/x
  3. Step 3: Cross multiply
    865,319.20x = 1,297,978.80 × 492,071.20
  4. Step 4: Simplify right side
    865,319.20x = 638,697,985,690.56
  5. Step 5: Solve for x
    x = 638,697,985,690.56/865,319.20
  6. Step 6: Final answer
    x = 738,106.80

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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.