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Finding the Fourth Proportional to 390,341.50, 538,671.63 and 211,493.50

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Solution

The fourth proportional to 390,341.50, 538,671.63 and 211,493.50 is: 291,861.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,341.50 : 538,671.63 = 211,493.50 : x
  2. Step 2: Convert to fraction form
    390,341.50/538,671.63 = 211,493.50/x
  3. Step 3: Cross multiply
    390,341.50x = 538,671.63 × 211,493.50
  4. Step 4: Simplify right side
    390,341.50x = 113,925,548,379.41
  5. Step 5: Solve for x
    x = 113,925,548,379.41/390,341.50
  6. Step 6: Final answer
    x = 291,861.23

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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.