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Finding the Fourth Proportional to 418,712.20, 628,068.30 and 376,721.80

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Solution

The fourth proportional to 418,712.20, 628,068.30 and 376,721.80 is: 565,082.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    418,712.20 : 628,068.30 = 376,721.80 : x
  2. Step 2: Convert to fraction form
    418,712.20/628,068.30 = 376,721.80/x
  3. Step 3: Cross multiply
    418,712.20x = 628,068.30 × 376,721.80
  4. Step 4: Simplify right side
    418,712.20x = 236,607,020,498.94
  5. Step 5: Solve for x
    x = 236,607,020,498.94/418,712.20
  6. Step 6: Final answer
    x = 565,082.70

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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.