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Finding the Fourth Proportional to 320,398.70, 480,220.79 and 130,740.71

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Solution

The fourth proportional to 320,398.70, 480,220.79 and 130,740.71 is: 195,957.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    320,398.70 : 480,220.79 = 130,740.71 : x
  2. Step 2: Convert to fraction form
    320,398.70/480,220.79 = 130,740.71/x
  3. Step 3: Cross multiply
    320,398.70x = 480,220.79 × 130,740.71
  4. Step 4: Simplify right side
    320,398.70x = 62,784,403,986.55
  5. Step 5: Solve for x
    x = 62,784,403,986.55/320,398.70
  6. Step 6: Final answer
    x = 195,957.12

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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.