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Finding the Fourth Proportional to 212,807.20, 319,210.80 and 209,696.80

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Solution

The fourth proportional to 212,807.20, 319,210.80 and 209,696.80 is: 314,545.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,807.20 : 319,210.80 = 209,696.80 : x
  2. Step 2: Convert to fraction form
    212,807.20/319,210.80 = 209,696.80/x
  3. Step 3: Cross multiply
    212,807.20x = 319,210.80 × 209,696.80
  4. Step 4: Simplify right side
    212,807.20x = 66,937,483,285.44
  5. Step 5: Solve for x
    x = 66,937,483,285.44/212,807.20
  6. Step 6: Final answer
    x = 314,545.20

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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.