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Finding the Fourth Proportional to 485,460.80, 728,191.20 and 434,139.20

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Solution

The fourth proportional to 485,460.80, 728,191.20 and 434,139.20 is: 651,208.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,460.80 : 728,191.20 = 434,139.20 : x
  2. Step 2: Convert to fraction form
    485,460.80/728,191.20 = 434,139.20/x
  3. Step 3: Cross multiply
    485,460.80x = 728,191.20 × 434,139.20
  4. Step 4: Simplify right side
    485,460.80x = 316,136,345,015.04
  5. Step 5: Solve for x
    x = 316,136,345,015.04/485,460.80
  6. Step 6: Final answer
    x = 651,208.80

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1.5x scale

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.