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Finding the Fourth Proportional to 420,129.47, 579,775.94 and 238,841.45

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Solution

The fourth proportional to 420,129.47, 579,775.94 and 238,841.45 is: 329,599.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,129.47 : 579,775.94 = 238,841.45 : x
  2. Step 2: Convert to fraction form
    420,129.47/579,775.94 = 238,841.45/x
  3. Step 3: Cross multiply
    420,129.47x = 579,775.94 × 238,841.45
  4. Step 4: Simplify right side
    420,129.47x = 138,474,525,161.44
  5. Step 5: Solve for x
    x = 138,474,525,161.44/420,129.47
  6. Step 6: Final answer
    x = 329,599.65

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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.