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Finding the Fourth Proportional to 390,039.40, 585,059.10 and 212,892.40

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Solution

The fourth proportional to 390,039.40, 585,059.10 and 212,892.40 is: 319,338.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,039.40 : 585,059.10 = 212,892.40 : x
  2. Step 2: Convert to fraction form
    390,039.40/585,059.10 = 212,892.40/x
  3. Step 3: Cross multiply
    390,039.40x = 585,059.10 × 212,892.40
  4. Step 4: Simplify right side
    390,039.40x = 124,554,635,940.84
  5. Step 5: Solve for x
    x = 124,554,635,940.84/390,039.40
  6. Step 6: Final answer
    x = 319,338.60

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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.