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Finding the Fourth Proportional to 585,911.40, 879,212.70 and 386,807.40

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Solution

The fourth proportional to 585,911.40, 879,212.70 and 386,807.40 is: 580,439.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    585,911.40 : 879,212.70 = 386,807.40 : x
  2. Step 2: Convert to fraction form
    585,911.40/879,212.70 = 386,807.40/x
  3. Step 3: Cross multiply
    585,911.40x = 879,212.70 × 386,807.40
  4. Step 4: Simplify right side
    585,911.40x = 340,085,978,533.98
  5. Step 5: Solve for x
    x = 340,085,978,533.98/585,911.40
  6. Step 6: Final answer
    x = 580,439.26

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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.