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Finding the Fourth Proportional to 518,893.20, 778,275.36 and 139,843.58

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Solution

The fourth proportional to 518,893.20, 778,275.36 and 139,843.58 is: 209,748.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,893.20 : 778,275.36 = 139,843.58 : x
  2. Step 2: Convert to fraction form
    518,893.20/778,275.36 = 139,843.58/x
  3. Step 3: Cross multiply
    518,893.20x = 778,275.36 × 139,843.58
  4. Step 4: Simplify right side
    518,893.20x = 108,836,812,568.19
  5. Step 5: Solve for x
    x = 108,836,812,568.19/518,893.20
  6. Step 6: Final answer
    x = 209,748.00

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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.