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Finding the Fourth Proportional to 873,724.64, 1,309,478.72 and 393,440

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Solution

The fourth proportional to 873,724.64, 1,309,478.72 and 393,440 is: 589,660.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    873,724.64 : 1,309,478.72 = 393,440 : x
  2. Step 2: Convert to fraction form
    873,724.64/1,309,478.72 = 393,440/x
  3. Step 3: Cross multiply
    873,724.64x = 1,309,478.72 × 393,440
  4. Step 4: Simplify right side
    873,724.64x = 515,201,307,596.80
  5. Step 5: Solve for x
    x = 515,201,307,596.80/873,724.64
  6. Step 6: Final answer
    x = 589,660.96

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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.