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Finding the Fourth Proportional to 632.15, 947.18 and 388.16

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Solution

The fourth proportional to 632.15, 947.18 and 388.16 is: 581.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    632.15 : 947.18 = 388.16 : x
  2. Step 2: Convert to fraction form
    632.15/947.18 = 388.16/x
  3. Step 3: Cross multiply
    632.15x = 947.18 × 388.16
  4. Step 4: Simplify right side
    632.15x = 367,650.71
  5. Step 5: Solve for x
    x = 367,650.71/632.15
  6. Step 6: Final answer
    x = 581.59

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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.