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Finding the Fourth Proportional to 509,780.70, 764,671.05 and 385,364.70

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Solution

The fourth proportional to 509,780.70, 764,671.05 and 385,364.70 is: 578,047.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    509,780.70 : 764,671.05 = 385,364.70 : x
  2. Step 2: Convert to fraction form
    509,780.70/764,671.05 = 385,364.70/x
  3. Step 3: Cross multiply
    509,780.70x = 764,671.05 × 385,364.70
  4. Step 4: Simplify right side
    509,780.70x = 294,677,229,781.94
  5. Step 5: Solve for x
    x = 294,677,229,781.94/509,780.70
  6. Step 6: Final answer
    x = 578,047.05

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Similar ratio
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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.