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Finding the Fourth Proportional to 551,493.70, 761,079.78 and 306,488.78

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Solution

The fourth proportional to 551,493.70, 761,079.78 and 306,488.78 is: 422,964.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    551,493.70 : 761,079.78 = 306,488.78 : x
  2. Step 2: Convert to fraction form
    551,493.70/761,079.78 = 306,488.78/x
  3. Step 3: Cross multiply
    551,493.70x = 761,079.78 × 306,488.78
  4. Step 4: Simplify right side
    551,493.70x = 233,262,412,303.52
  5. Step 5: Solve for x
    x = 233,262,412,303.52/551,493.70
  6. Step 6: Final answer
    x = 422,964.78

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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.