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Finding the Fourth Proportional to 485,426.39, 728,138.95 and 130,440.41

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Solution

The fourth proportional to 485,426.39, 728,138.95 and 130,440.41 is: 195,660.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,426.39 : 728,138.95 = 130,440.41 : x
  2. Step 2: Convert to fraction form
    485,426.39/728,138.95 = 130,440.41/x
  3. Step 3: Cross multiply
    485,426.39x = 728,138.95 × 130,440.41
  4. Step 4: Simplify right side
    485,426.39x = 94,978,742,672.42
  5. Step 5: Solve for x
    x = 94,978,742,672.42/485,426.39
  6. Step 6: Final answer
    x = 195,660.45

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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.