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Finding the Fourth Proportional to 280,725.88, 387,411.28 and 153,409.68

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Solution

The fourth proportional to 280,725.88, 387,411.28 and 153,409.68 is: 211,710.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,725.88 : 387,411.28 = 153,409.68 : x
  2. Step 2: Convert to fraction form
    280,725.88/387,411.28 = 153,409.68/x
  3. Step 3: Cross multiply
    280,725.88x = 387,411.28 × 153,409.68
  4. Step 4: Simplify right side
    280,725.88x = 59,432,640,493.19
  5. Step 5: Solve for x
    x = 59,432,640,493.19/280,725.88
  6. Step 6: Final answer
    x = 211,710.59

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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.