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Finding the Fourth Proportional to 398,898.26, 552,808.42 and 391,328.51

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Solution

The fourth proportional to 398,898.26, 552,808.42 and 391,328.51 is: 542,317.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,898.26 : 552,808.42 = 391,328.51 : x
  2. Step 2: Convert to fraction form
    398,898.26/552,808.42 = 391,328.51/x
  3. Step 3: Cross multiply
    398,898.26x = 552,808.42 × 391,328.51
  4. Step 4: Simplify right side
    398,898.26x = 216,329,693,357.41
  5. Step 5: Solve for x
    x = 216,329,693,357.41/398,898.26
  6. Step 6: Final answer
    x = 542,317.97

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.