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Finding the Fourth Proportional to 783.30, 1,080.90 and 451.80

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Solution

The fourth proportional to 783.30, 1,080.90 and 451.80 is: 623.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.30 : 1,080.90 = 451.80 : x
  2. Step 2: Convert to fraction form
    783.30/1,080.90 = 451.80/x
  3. Step 3: Cross multiply
    783.30x = 1,080.90 × 451.80
  4. Step 4: Simplify right side
    783.30x = 488,350.62
  5. Step 5: Solve for x
    x = 488,350.62/783.30
  6. Step 6: Final answer
    x = 623.45

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1.5x scale

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.