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Finding the Fourth Proportional to 611,915.95, 843,763.26 and 418,355.20

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Solution

The fourth proportional to 611,915.95, 843,763.26 and 418,355.20 is: 576,864.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,915.95 : 843,763.26 = 418,355.20 : x
  2. Step 2: Convert to fraction form
    611,915.95/843,763.26 = 418,355.20/x
  3. Step 3: Cross multiply
    611,915.95x = 843,763.26 × 418,355.20
  4. Step 4: Simplify right side
    611,915.95x = 352,992,747,389.95
  5. Step 5: Solve for x
    x = 352,992,747,389.95/611,915.95
  6. Step 6: Final answer
    x = 576,864.76

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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.