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Finding the Fourth Proportional to 280,710.56, 387,383.31 and 153,388.89

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Solution

The fourth proportional to 280,710.56, 387,383.31 and 153,388.89 is: 211,678.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,710.56 : 387,383.31 = 153,388.89 : x
  2. Step 2: Convert to fraction form
    280,710.56/387,383.31 = 153,388.89/x
  3. Step 3: Cross multiply
    280,710.56x = 387,383.31 × 153,388.89
  4. Step 4: Simplify right side
    280,710.56x = 59,420,295,925.43
  5. Step 5: Solve for x
    x = 59,420,295,925.43/280,710.56
  6. Step 6: Final answer
    x = 211,678.16

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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.