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Finding the Fourth Proportional to 307,220.40, 461,521.80 and 213,908.40

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Solution

The fourth proportional to 307,220.40, 461,521.80 and 213,908.40 is: 321,343.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    307,220.40 : 461,521.80 = 213,908.40 : x
  2. Step 2: Convert to fraction form
    307,220.40/461,521.80 = 213,908.40/x
  3. Step 3: Cross multiply
    307,220.40x = 461,521.80 × 213,908.40
  4. Step 4: Simplify right side
    307,220.40x = 98,723,389,803.12
  5. Step 5: Solve for x
    x = 98,723,389,803.12/307,220.40
  6. Step 6: Final answer
    x = 321,343.86

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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.