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Finding the Fourth Proportional to 280,606.90, 387,223.08 and 153,257.90

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Solution

The fourth proportional to 280,606.90, 387,223.08 and 153,257.90 is: 211,488.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,606.90 : 387,223.08 = 153,257.90 : x
  2. Step 2: Convert to fraction form
    280,606.90/387,223.08 = 153,257.90/x
  3. Step 3: Cross multiply
    280,606.90x = 387,223.08 × 153,257.90
  4. Step 4: Simplify right side
    280,606.90x = 59,344,996,072.33
  5. Step 5: Solve for x
    x = 59,344,996,072.33/280,606.90
  6. Step 6: Final answer
    x = 211,488.01

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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.