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Finding the Fourth Proportional to 280,463.75, 387,038.44 and 153,138.43

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Solution

The fourth proportional to 280,463.75, 387,038.44 and 153,138.43 is: 211,330.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,463.75 : 387,038.44 = 153,138.43 : x
  2. Step 2: Convert to fraction form
    280,463.75/387,038.44 = 153,138.43/x
  3. Step 3: Cross multiply
    280,463.75x = 387,038.44 × 153,138.43
  4. Step 4: Simplify right side
    280,463.75x = 59,270,456,350.36
  5. Step 5: Solve for x
    x = 59,270,456,350.36/280,463.75
  6. Step 6: Final answer
    x = 211,330.19

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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.