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Finding the Fourth Proportional to 772.70, 1,066.20 and 457.80

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Solution

The fourth proportional to 772.70, 1,066.20 and 457.80 is: 631.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.70 : 1,066.20 = 457.80 : x
  2. Step 2: Convert to fraction form
    772.70/1,066.20 = 457.80/x
  3. Step 3: Cross multiply
    772.70x = 1,066.20 × 457.80
  4. Step 4: Simplify right side
    772.70x = 488,106.36
  5. Step 5: Solve for x
    x = 488,106.36/772.70
  6. Step 6: Final answer
    x = 631.69

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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.