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Finding the Fourth Proportional to 427,246.40, 640,869.60 and 389,921.60

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Solution

The fourth proportional to 427,246.40, 640,869.60 and 389,921.60 is: 584,882.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,246.40 : 640,869.60 = 389,921.60 : x
  2. Step 2: Convert to fraction form
    427,246.40/640,869.60 = 389,921.60/x
  3. Step 3: Cross multiply
    427,246.40x = 640,869.60 × 389,921.60
  4. Step 4: Simplify right side
    427,246.40x = 249,888,899,823.36
  5. Step 5: Solve for x
    x = 249,888,899,823.36/427,246.40
  6. Step 6: Final answer
    x = 584,882.40

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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.