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Finding the Fourth Proportional to 420,115.87, 579,594.85 and 258,690.97

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Solution

The fourth proportional to 420,115.87, 579,594.85 and 258,690.97 is: 356,891.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,115.87 : 579,594.85 = 258,690.97 : x
  2. Step 2: Convert to fraction form
    420,115.87/579,594.85 = 258,690.97/x
  3. Step 3: Cross multiply
    420,115.87x = 579,594.85 × 258,690.97
  4. Step 4: Simplify right side
    420,115.87x = 149,935,953,953.51
  5. Step 5: Solve for x
    x = 149,935,953,953.51/420,115.87
  6. Step 6: Final answer
    x = 356,891.91

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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.