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Finding the Fourth Proportional to 551,145.34, 760,574.10 and 309,421.90

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Solution

The fourth proportional to 551,145.34, 760,574.10 and 309,421.90 is: 426,998.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    551,145.34 : 760,574.10 = 309,421.90 : x
  2. Step 2: Convert to fraction form
    551,145.34/760,574.10 = 309,421.90/x
  3. Step 3: Cross multiply
    551,145.34x = 760,574.10 × 309,421.90
  4. Step 4: Simplify right side
    551,145.34x = 235,338,283,112.79
  5. Step 5: Solve for x
    x = 235,338,283,112.79/551,145.34
  6. Step 6: Final answer
    x = 426,998.59

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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.