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Finding the Fourth Proportional to 429,242.90, 643,878.05 and 215,894.36

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Solution

The fourth proportional to 429,242.90, 643,878.05 and 215,894.36 is: 323,848.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    429,242.90 : 643,878.05 = 215,894.36 : x
  2. Step 2: Convert to fraction form
    429,242.90/643,878.05 = 215,894.36/x
  3. Step 3: Cross multiply
    429,242.90x = 643,878.05 × 215,894.36
  4. Step 4: Simplify right side
    429,242.90x = 139,009,635,223.94
  5. Step 5: Solve for x
    x = 139,009,635,223.94/429,242.90
  6. Step 6: Final answer
    x = 323,848.42

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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.