Home / 390,426.20-585,236.10-212,557.40

Finding the Fourth Proportional to 390,426.20, 585,236.10 and 212,557.40

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Solution

The fourth proportional to 390,426.20, 585,236.10 and 212,557.40 is: 318,616.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,426.20 : 585,236.10 = 212,557.40 : x
  2. Step 2: Convert to fraction form
    390,426.20/585,236.10 = 212,557.40/x
  3. Step 3: Cross multiply
    390,426.20x = 585,236.10 × 212,557.40
  4. Step 4: Simplify right side
    390,426.20x = 124,396,263,802.14
  5. Step 5: Solve for x
    x = 124,396,263,802.14/390,426.20
  6. Step 6: Final answer
    x = 318,616.59

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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.