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Finding the Fourth Proportional to 213,389.78, 318,139.81 and 207,936.86

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Solution

The fourth proportional to 213,389.78, 318,139.81 and 207,936.86 is: 310,010.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    213,389.78 : 318,139.81 = 207,936.86 : x
  2. Step 2: Convert to fraction form
    213,389.78/318,139.81 = 207,936.86/x
  3. Step 3: Cross multiply
    213,389.78x = 318,139.81 × 207,936.86
  4. Step 4: Simplify right side
    213,389.78x = 66,152,993,132.40
  5. Step 5: Solve for x
    x = 66,152,993,132.40/213,389.78
  6. Step 6: Final answer
    x = 310,010.13

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.