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Finding the Fourth Proportional to 486,038.40, 729,057.60 and 428,301.60

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Solution

The fourth proportional to 486,038.40, 729,057.60 and 428,301.60 is: 642,452.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    486,038.40 : 729,057.60 = 428,301.60 : x
  2. Step 2: Convert to fraction form
    486,038.40/729,057.60 = 428,301.60/x
  3. Step 3: Cross multiply
    486,038.40x = 729,057.60 × 428,301.60
  4. Step 4: Simplify right side
    486,038.40x = 312,256,536,572.16
  5. Step 5: Solve for x
    x = 312,256,536,572.16/486,038.40
  6. Step 6: Final answer
    x = 642,452.40

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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.