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Finding the Fourth Proportional to 438,135.40, 657,203.10 and 280,671.40

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Solution

The fourth proportional to 438,135.40, 657,203.10 and 280,671.40 is: 421,007.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,135.40 : 657,203.10 = 280,671.40 : x
  2. Step 2: Convert to fraction form
    438,135.40/657,203.10 = 280,671.40/x
  3. Step 3: Cross multiply
    438,135.40x = 657,203.10 × 280,671.40
  4. Step 4: Simplify right side
    438,135.40x = 184,458,114,161.34
  5. Step 5: Solve for x
    x = 184,458,114,161.34/438,135.40
  6. Step 6: Final answer
    x = 421,007.10

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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.