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Finding the Fourth Proportional to 438,689.60, 657,979.32 and 139,201.28

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Solution

The fourth proportional to 438,689.60, 657,979.32 and 139,201.28 is: 208,784.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,689.60 : 657,979.32 = 139,201.28 : x
  2. Step 2: Convert to fraction form
    438,689.60/657,979.32 = 139,201.28/x
  3. Step 3: Cross multiply
    438,689.60x = 657,979.32 × 139,201.28
  4. Step 4: Simplify right side
    438,689.60x = 91,591,563,557.53
  5. Step 5: Solve for x
    x = 91,591,563,557.53/438,689.60
  6. Step 6: Final answer
    x = 208,784.44

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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.