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Finding the Fourth Proportional to 321,689.20, 482,922.60 and 319,356.40

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Solution

The fourth proportional to 321,689.20, 482,922.60 and 319,356.40 is: 479,420.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    321,689.20 : 482,922.60 = 319,356.40 : x
  2. Step 2: Convert to fraction form
    321,689.20/482,922.60 = 319,356.40/x
  3. Step 3: Cross multiply
    321,689.20x = 482,922.60 × 319,356.40
  4. Step 4: Simplify right side
    321,689.20x = 154,224,423,014.64
  5. Step 5: Solve for x
    x = 154,224,423,014.64/321,689.20
  6. Step 6: Final answer
    x = 479,420.58

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.