Home / 839,478.60-1,258,531.74-390,479.40

Finding the Fourth Proportional to 839,478.60, 1,258,531.74 and 390,479.40

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Solution

The fourth proportional to 839,478.60, 1,258,531.74 and 390,479.40 is: 585,399.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    839,478.60 : 1,258,531.74 = 390,479.40 : x
  2. Step 2: Convert to fraction form
    839,478.60/1,258,531.74 = 390,479.40/x
  3. Step 3: Cross multiply
    839,478.60x = 1,258,531.74 × 390,479.40
  4. Step 4: Simplify right side
    839,478.60x = 491,430,718,716.16
  5. Step 5: Solve for x
    x = 491,430,718,716.16/839,478.60
  6. Step 6: Final answer
    x = 585,399.94

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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.