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Finding the Fourth Proportional to 938.15, 1,407.06 and 345.04

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Solution

The fourth proportional to 938.15, 1,407.06 and 345.04 is: 517.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.15 : 1,407.06 = 345.04 : x
  2. Step 2: Convert to fraction form
    938.15/1,407.06 = 345.04/x
  3. Step 3: Cross multiply
    938.15x = 1,407.06 × 345.04
  4. Step 4: Simplify right side
    938.15x = 485,483.22
  5. Step 5: Solve for x
    x = 485,483.22/938.15
  6. Step 6: Final answer
    x = 517.49

Related Problems

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Half scale
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Double scale
Find fourth proportional to 939.15, 1,408.55 and 346.04
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.