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Finding the Fourth Proportional to 670.70, 925.60 and 387.16

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Solution

The fourth proportional to 670.70, 925.60 and 387.16 is: 534.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.70 : 925.60 = 387.16 : x
  2. Step 2: Convert to fraction form
    670.70/925.60 = 387.16/x
  3. Step 3: Cross multiply
    670.70x = 925.60 × 387.16
  4. Step 4: Simplify right side
    670.70x = 358,352.01
  5. Step 5: Solve for x
    x = 358,352.01/670.70
  6. Step 6: Final answer
    x = 534.30

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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.