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Finding the Fourth Proportional to 384,805.20, 531,029.64 and 215,039.28

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Solution

The fourth proportional to 384,805.20, 531,029.64 and 215,039.28 is: 296,753.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    384,805.20 : 531,029.64 = 215,039.28 : x
  2. Step 2: Convert to fraction form
    384,805.20/531,029.64 = 215,039.28/x
  3. Step 3: Cross multiply
    384,805.20x = 531,029.64 × 215,039.28
  4. Step 4: Simplify right side
    384,805.20x = 114,192,231,444.26
  5. Step 5: Solve for x
    x = 114,192,231,444.26/384,805.20
  6. Step 6: Final answer
    x = 296,753.35

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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.