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Finding the Fourth Proportional to 865,138.40, 1,297,804.80 and 266,094.80

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Solution

The fourth proportional to 865,138.40, 1,297,804.80 and 266,094.80 is: 399,172.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    865,138.40 : 1,297,804.80 = 266,094.80 : x
  2. Step 2: Convert to fraction form
    865,138.40/1,297,804.80 = 266,094.80/x
  3. Step 3: Cross multiply
    865,138.40x = 1,297,804.80 × 266,094.80
  4. Step 4: Simplify right side
    865,138.40x = 345,339,108,695.04
  5. Step 5: Solve for x
    x = 345,339,108,695.04/865,138.40
  6. Step 6: Final answer
    x = 399,172.10

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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.