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Finding the Fourth Proportional to 551,698.18, 761,322.28 and 309,990.94

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Solution

The fourth proportional to 551,698.18, 761,322.28 and 309,990.94 is: 427,775.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    551,698.18 : 761,322.28 = 309,990.94 : x
  2. Step 2: Convert to fraction form
    551,698.18/761,322.28 = 309,990.94/x
  3. Step 3: Cross multiply
    551,698.18x = 761,322.28 × 309,990.94
  4. Step 4: Simplify right side
    551,698.18x = 236,003,009,220.14
  5. Step 5: Solve for x
    x = 236,003,009,220.14/551,698.18
  6. Step 6: Final answer
    x = 427,775.58

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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.