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Finding the Fourth Proportional to 607.14, 838.26 and 386.19

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Solution

The fourth proportional to 607.14, 838.26 and 386.19 is: 533.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    607.14 : 838.26 = 386.19 : x
  2. Step 2: Convert to fraction form
    607.14/838.26 = 386.19/x
  3. Step 3: Cross multiply
    607.14x = 838.26 × 386.19
  4. Step 4: Simplify right side
    607.14x = 323,727.63
  5. Step 5: Solve for x
    x = 323,727.63/607.14
  6. Step 6: Final answer
    x = 533.20

Related Problems

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Half scale
Find fourth proportional to 1,214.28, 1,676.52 and 772.38
Double scale
Find fourth proportional to 608.14, 839.64 and 387.19
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.