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Finding the Fourth Proportional to 683.45, 943.18 and 388.77

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Solution

The fourth proportional to 683.45, 943.18 and 388.77 is: 536.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.45 : 943.18 = 388.77 : x
  2. Step 2: Convert to fraction form
    683.45/943.18 = 388.77/x
  3. Step 3: Cross multiply
    683.45x = 943.18 × 388.77
  4. Step 4: Simplify right side
    683.45x = 366,675.58
  5. Step 5: Solve for x
    x = 366,675.58/683.45
  6. Step 6: Final answer
    x = 536.51

Related Problems

Find fourth proportional to 341.72, 471.59 and 194.38
Half scale
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Double scale
Find fourth proportional to 684.45, 944.56 and 389.77
Similar ratio
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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.