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Finding the Fourth Proportional to 656,638.55, 906,220.58 and 398,581.21

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Solution

The fourth proportional to 656,638.55, 906,220.58 and 398,581.21 is: 550,078.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    656,638.55 : 906,220.58 = 398,581.21 : x
  2. Step 2: Convert to fraction form
    656,638.55/906,220.58 = 398,581.21/x
  3. Step 3: Cross multiply
    656,638.55x = 906,220.58 × 398,581.21
  4. Step 4: Simplify right side
    656,638.55x = 361,202,492,708.71
  5. Step 5: Solve for x
    x = 361,202,492,708.71/656,638.55
  6. Step 6: Final answer
    x = 550,078.11

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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.