Home / 686,288.78-947,136.03-380,439.98

Finding the Fourth Proportional to 686,288.78, 947,136.03 and 380,439.98

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Solution

The fourth proportional to 686,288.78, 947,136.03 and 380,439.98 is: 525,039.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    686,288.78 : 947,136.03 = 380,439.98 : x
  2. Step 2: Convert to fraction form
    686,288.78/947,136.03 = 380,439.98/x
  3. Step 3: Cross multiply
    686,288.78x = 947,136.03 × 380,439.98
  4. Step 4: Simplify right side
    686,288.78x = 360,328,412,310.48
  5. Step 5: Solve for x
    x = 360,328,412,310.48/686,288.78
  6. Step 6: Final answer
    x = 525,039.05

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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.