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Finding the Fourth Proportional to 811.55, 1,119.90 and 457.48

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Solution

The fourth proportional to 811.55, 1,119.90 and 457.48 is: 631.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.55 : 1,119.90 = 457.48 : x
  2. Step 2: Convert to fraction form
    811.55/1,119.90 = 457.48/x
  3. Step 3: Cross multiply
    811.55x = 1,119.90 × 457.48
  4. Step 4: Simplify right side
    811.55x = 512,331.85
  5. Step 5: Solve for x
    x = 512,331.85/811.55
  6. Step 6: Final answer
    x = 631.30

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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.