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Finding the Fourth Proportional to 509,976.70, 764,965.05 and 421,330.30

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Solution

The fourth proportional to 509,976.70, 764,965.05 and 421,330.30 is: 631,995.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    509,976.70 : 764,965.05 = 421,330.30 : x
  2. Step 2: Convert to fraction form
    509,976.70/764,965.05 = 421,330.30/x
  3. Step 3: Cross multiply
    509,976.70x = 764,965.05 × 421,330.30
  4. Step 4: Simplify right side
    509,976.70x = 322,302,954,006.02
  5. Step 5: Solve for x
    x = 322,302,954,006.02/509,976.70
  6. Step 6: Final answer
    x = 631,995.45

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Double scale
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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.