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Finding the Fourth Proportional to 438,432.40, 657,648.60 and 389,443.60

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Solution

The fourth proportional to 438,432.40, 657,648.60 and 389,443.60 is: 584,165.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,432.40 : 657,648.60 = 389,443.60 : x
  2. Step 2: Convert to fraction form
    438,432.40/657,648.60 = 389,443.60/x
  3. Step 3: Cross multiply
    438,432.40x = 657,648.60 × 389,443.60
  4. Step 4: Simplify right side
    438,432.40x = 256,117,038,318.96
  5. Step 5: Solve for x
    x = 256,117,038,318.96/438,432.40
  6. Step 6: Final answer
    x = 584,165.40

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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.