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Finding the Fourth Proportional to 402,426.34, 554,793.45 and 321,030.86

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Solution

The fourth proportional to 402,426.34, 554,793.45 and 321,030.86 is: 442,579.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,426.34 : 554,793.45 = 321,030.86 : x
  2. Step 2: Convert to fraction form
    402,426.34/554,793.45 = 321,030.86/x
  3. Step 3: Cross multiply
    402,426.34x = 554,793.45 × 321,030.86
  4. Step 4: Simplify right side
    402,426.34x = 178,105,818,375.87
  5. Step 5: Solve for x
    x = 178,105,818,375.87/402,426.34
  6. Step 6: Final answer
    x = 442,579.92

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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.