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Finding the Fourth Proportional to 667,856.40, 921,639.76 and 361,941.56

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Solution

The fourth proportional to 667,856.40, 921,639.76 and 361,941.56 is: 499,478.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,856.40 : 921,639.76 = 361,941.56 : x
  2. Step 2: Convert to fraction form
    667,856.40/921,639.76 = 361,941.56/x
  3. Step 3: Cross multiply
    667,856.40x = 921,639.76 × 361,941.56
  4. Step 4: Simplify right side
    667,856.40x = 333,579,732,492.43
  5. Step 5: Solve for x
    x = 333,579,732,492.43/667,856.40
  6. Step 6: Final answer
    x = 499,478.23

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1.5x scale

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.