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Finding the Fourth Proportional to 388,313.40, 582,470.10 and 138,905.40

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Solution

The fourth proportional to 388,313.40, 582,470.10 and 138,905.40 is: 208,358.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,313.40 : 582,470.10 = 138,905.40 : x
  2. Step 2: Convert to fraction form
    388,313.40/582,470.10 = 138,905.40/x
  3. Step 3: Cross multiply
    388,313.40x = 582,470.10 × 138,905.40
  4. Step 4: Simplify right side
    388,313.40x = 80,908,242,228.54
  5. Step 5: Solve for x
    x = 80,908,242,228.54/388,313.40
  6. Step 6: Final answer
    x = 208,358.10

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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.