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Finding the Fourth Proportional to 670,378.01, 925,419.86 and 398,533.91

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Solution

The fourth proportional to 670,378.01, 925,419.86 and 398,533.91 is: 550,154.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    670,378.01 : 925,419.86 = 398,533.91 : x
  2. Step 2: Convert to fraction form
    670,378.01/925,419.86 = 398,533.91/x
  3. Step 3: Cross multiply
    670,378.01x = 925,419.86 × 398,533.91
  4. Step 4: Simplify right side
    670,378.01x = 368,811,195,197.45
  5. Step 5: Solve for x
    x = 368,811,195,197.45/670,378.01
  6. Step 6: Final answer
    x = 550,154.08

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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.