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Finding the Fourth Proportional to 280,676.59, 387,329.17 and 153,349.45

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Solution

The fourth proportional to 280,676.59, 387,329.17 and 153,349.45 is: 211,619.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,676.59 : 387,329.17 = 153,349.45 : x
  2. Step 2: Convert to fraction form
    280,676.59/387,329.17 = 153,349.45/x
  3. Step 3: Cross multiply
    280,676.59x = 387,329.17 × 153,349.45
  4. Step 4: Simplify right side
    280,676.59x = 59,396,715,188.46
  5. Step 5: Solve for x
    x = 59,396,715,188.46/280,676.59
  6. Step 6: Final answer
    x = 211,619.77

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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.