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Finding the Fourth Proportional to 387,320.40, 580,980.60 and 340,664.40

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Solution

The fourth proportional to 387,320.40, 580,980.60 and 340,664.40 is: 510,996.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,320.40 : 580,980.60 = 340,664.40 : x
  2. Step 2: Convert to fraction form
    387,320.40/580,980.60 = 340,664.40/x
  3. Step 3: Cross multiply
    387,320.40x = 580,980.60 × 340,664.40
  4. Step 4: Simplify right side
    387,320.40x = 197,919,407,510.64
  5. Step 5: Solve for x
    x = 197,919,407,510.64/387,320.40
  6. Step 6: Final answer
    x = 510,996.60

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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.