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Finding the Fourth Proportional to 776.77, 1,072.10 and 440.68

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Solution

The fourth proportional to 776.77, 1,072.10 and 440.68 is: 608.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.77 : 1,072.10 = 440.68 : x
  2. Step 2: Convert to fraction form
    776.77/1,072.10 = 440.68/x
  3. Step 3: Cross multiply
    776.77x = 1,072.10 × 440.68
  4. Step 4: Simplify right side
    776.77x = 472,448.14
  5. Step 5: Solve for x
    x = 472,448.14/776.77
  6. Step 6: Final answer
    x = 608.22

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Find fourth proportional to 388.38, 536.05 and 220.34
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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.