Home / 686,287.78-947,134.65-380,438.98

Finding the Fourth Proportional to 686,287.78, 947,134.65 and 380,438.98

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Solution

The fourth proportional to 686,287.78, 947,134.65 and 380,438.98 is: 525,037.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    686,287.78 : 947,134.65 = 380,438.98 : x
  2. Step 2: Convert to fraction form
    686,287.78/947,134.65 = 380,438.98/x
  3. Step 3: Cross multiply
    686,287.78x = 947,134.65 × 380,438.98
  4. Step 4: Simplify right side
    686,287.78x = 360,326,940,168.66
  5. Step 5: Solve for x
    x = 360,326,940,168.66/686,287.78
  6. Step 6: Final answer
    x = 525,037.67

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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.