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Finding the Fourth Proportional to 319,614.40, 478,984.20 and 212,694.40

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Solution

The fourth proportional to 319,614.40, 478,984.20 and 212,694.40 is: 318,750.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    319,614.40 : 478,984.20 = 212,694.40 : x
  2. Step 2: Convert to fraction form
    319,614.40/478,984.20 = 212,694.40/x
  3. Step 3: Cross multiply
    319,614.40x = 478,984.20 × 212,694.40
  4. Step 4: Simplify right side
    319,614.40x = 101,877,257,028.48
  5. Step 5: Solve for x
    x = 101,877,257,028.48/319,614.40
  6. Step 6: Final answer
    x = 318,750.52

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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.