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Finding the Fourth Proportional to 565,821.51, 780,818.13 and 311,172.69

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Solution

The fourth proportional to 565,821.51, 780,818.13 and 311,172.69 is: 429,409.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    565,821.51 : 780,818.13 = 311,172.69 : x
  2. Step 2: Convert to fraction form
    565,821.51/780,818.13 = 311,172.69/x
  3. Step 3: Cross multiply
    565,821.51x = 780,818.13 × 311,172.69
  4. Step 4: Simplify right side
    565,821.51x = 242,969,277,912.87
  5. Step 5: Solve for x
    x = 242,969,277,912.87/565,821.51
  6. Step 6: Final answer
    x = 429,409.76

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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.