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Finding the Fourth Proportional to 935.15, 1,401.71 and 386.98

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Solution

The fourth proportional to 935.15, 1,401.71 and 386.98 is: 580.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.15 : 1,401.71 = 386.98 : x
  2. Step 2: Convert to fraction form
    935.15/1,401.71 = 386.98/x
  3. Step 3: Cross multiply
    935.15x = 1,401.71 × 386.98
  4. Step 4: Simplify right side
    935.15x = 542,428.30
  5. Step 5: Solve for x
    x = 542,428.30/935.15
  6. Step 6: Final answer
    x = 580.05

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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.