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Finding the Fourth Proportional to 545,107.20, 817,806.60 and 387,643.20

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Solution

The fourth proportional to 545,107.20, 817,806.60 and 387,643.20 is: 581,568.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    545,107.20 : 817,806.60 = 387,643.20 : x
  2. Step 2: Convert to fraction form
    545,107.20/817,806.60 = 387,643.20/x
  3. Step 3: Cross multiply
    545,107.20x = 817,806.60 × 387,643.20
  4. Step 4: Simplify right side
    545,107.20x = 317,017,167,405.12
  5. Step 5: Solve for x
    x = 317,017,167,405.12/545,107.20
  6. Step 6: Final answer
    x = 581,568.48

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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.