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Finding the Fourth Proportional to 399,890.59, 551,483.24 and 312,687

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Solution

The fourth proportional to 399,890.59, 551,483.24 and 312,687 is: 431,222.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,890.59 : 551,483.24 = 312,687 : x
  2. Step 2: Convert to fraction form
    399,890.59/551,483.24 = 312,687/x
  3. Step 3: Cross multiply
    399,890.59x = 551,483.24 × 312,687
  4. Step 4: Simplify right side
    399,890.59x = 172,441,638,302.45
  5. Step 5: Solve for x
    x = 172,441,638,302.45/399,890.59
  6. Step 6: Final answer
    x = 431,222.05

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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.