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Finding the Fourth Proportional to 686,931.48, 947,917.86 and 380,978.88

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Solution

The fourth proportional to 686,931.48, 947,917.86 and 380,978.88 is: 525,724.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    686,931.48 : 947,917.86 = 380,978.88 : x
  2. Step 2: Convert to fraction form
    686,931.48/947,917.86 = 380,978.88/x
  3. Step 3: Cross multiply
    686,931.48x = 947,917.86 × 380,978.88
  4. Step 4: Simplify right side
    686,931.48x = 361,136,684,634.80
  5. Step 5: Solve for x
    x = 361,136,684,634.80/686,931.48
  6. Step 6: Final answer
    x = 525,724.46

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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.