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Finding the Fourth Proportional to 772.45, 1,066.12 and 492.77

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Solution

The fourth proportional to 772.45, 1,066.12 and 492.77 is: 680.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.45 : 1,066.12 = 492.77 : x
  2. Step 2: Convert to fraction form
    772.45/1,066.12 = 492.77/x
  3. Step 3: Cross multiply
    772.45x = 1,066.12 × 492.77
  4. Step 4: Simplify right side
    772.45x = 525,349.39
  5. Step 5: Solve for x
    x = 525,349.39/772.45
  6. Step 6: Final answer
    x = 680.11

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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.