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Finding the Fourth Proportional to 976.95, 1,465.35 and 391.93

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Solution

The fourth proportional to 976.95, 1,465.35 and 391.93 is: 587.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.95 : 1,465.35 = 391.93 : x
  2. Step 2: Convert to fraction form
    976.95/1,465.35 = 391.93/x
  3. Step 3: Cross multiply
    976.95x = 1,465.35 × 391.93
  4. Step 4: Simplify right side
    976.95x = 574,315.61
  5. Step 5: Solve for x
    x = 574,315.61/976.95
  6. Step 6: Final answer
    x = 587.86

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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.