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Finding the Fourth Proportional to 280,755.72, 387,443.04 and 153,431.31

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Solution

The fourth proportional to 280,755.72, 387,443.04 and 153,431.31 is: 211,735.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,755.72 : 387,443.04 = 153,431.31 : x
  2. Step 2: Convert to fraction form
    280,755.72/387,443.04 = 153,431.31/x
  3. Step 3: Cross multiply
    280,755.72x = 387,443.04 × 153,431.31
  4. Step 4: Simplify right side
    280,755.72x = 59,445,893,177.58
  5. Step 5: Solve for x
    x = 59,445,893,177.58/280,755.72
  6. Step 6: Final answer
    x = 211,735.29

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.