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Finding the Fourth Proportional to 711,803.70, 982,303.20 and 389,512.80

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Solution

The fourth proportional to 711,803.70, 982,303.20 and 389,512.80 is: 537,535.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    711,803.70 : 982,303.20 = 389,512.80 : x
  2. Step 2: Convert to fraction form
    711,803.70/982,303.20 = 389,512.80/x
  3. Step 3: Cross multiply
    711,803.70x = 982,303.20 × 389,512.80
  4. Step 4: Simplify right side
    711,803.70x = 382,619,669,880.96
  5. Step 5: Solve for x
    x = 382,619,669,880.96/711,803.70
  6. Step 6: Final answer
    x = 537,535.38

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Double scale
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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.