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Finding the Fourth Proportional to 517,939.20, 776,908.80 and 307,814.40

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Solution

The fourth proportional to 517,939.20, 776,908.80 and 307,814.40 is: 461,721.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    517,939.20 : 776,908.80 = 307,814.40 : x
  2. Step 2: Convert to fraction form
    517,939.20/776,908.80 = 307,814.40/x
  3. Step 3: Cross multiply
    517,939.20x = 776,908.80 × 307,814.40
  4. Step 4: Simplify right side
    517,939.20x = 239,143,716,126.72
  5. Step 5: Solve for x
    x = 239,143,716,126.72/517,939.20
  6. Step 6: Final answer
    x = 461,721.60

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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.