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Finding the Fourth Proportional to 485,490, 669,701.80 and 303,886.68

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Solution

The fourth proportional to 485,490, 669,701.80 and 303,886.68 is: 419,191.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,490 : 669,701.80 = 303,886.68 : x
  2. Step 2: Convert to fraction form
    485,490/669,701.80 = 303,886.68/x
  3. Step 3: Cross multiply
    485,490x = 669,701.80 × 303,886.68
  4. Step 4: Simplify right side
    485,490x = 203,513,456,592.02
  5. Step 5: Solve for x
    x = 203,513,456,592.02/485,490
  6. Step 6: Final answer
    x = 419,191.86

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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.