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Finding the Fourth Proportional to 786.78, 1,086.24 and 525.24

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Solution

The fourth proportional to 786.78, 1,086.24 and 525.24 is: 725.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.78 : 1,086.24 = 525.24 : x
  2. Step 2: Convert to fraction form
    786.78/1,086.24 = 525.24/x
  3. Step 3: Cross multiply
    786.78x = 1,086.24 × 525.24
  4. Step 4: Simplify right side
    786.78x = 570,536.70
  5. Step 5: Solve for x
    x = 570,536.70/786.78
  6. Step 6: Final answer
    x = 725.15

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Half scale
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Double scale
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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.