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Finding the Fourth Proportional to 1,138.77, 1,571.55 and 641.46

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Solution

The fourth proportional to 1,138.77, 1,571.55 and 641.46 is: 885.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.77 : 1,571.55 = 641.46 : x
  2. Step 2: Convert to fraction form
    1,138.77/1,571.55 = 641.46/x
  3. Step 3: Cross multiply
    1,138.77x = 1,571.55 × 641.46
  4. Step 4: Simplify right side
    1,138.77x = 1,008,086.46
  5. Step 5: Solve for x
    x = 1,008,086.46/1,138.77
  6. Step 6: Final answer
    x = 885.25

Related Problems

Find fourth proportional to 569.38, 785.78 and 320.73
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.