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Finding the Fourth Proportional to 429,726.80, 644,590.20 and 386,181.20

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Solution

The fourth proportional to 429,726.80, 644,590.20 and 386,181.20 is: 579,271.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    429,726.80 : 644,590.20 = 386,181.20 : x
  2. Step 2: Convert to fraction form
    429,726.80/644,590.20 = 386,181.20/x
  3. Step 3: Cross multiply
    429,726.80x = 644,590.20 × 386,181.20
  4. Step 4: Simplify right side
    429,726.80x = 248,928,616,944.24
  5. Step 5: Solve for x
    x = 248,928,616,944.24/429,726.80
  6. Step 6: Final answer
    x = 579,271.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.