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Finding the Fourth Proportional to 864.15, 1,295.21 and 315.99

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Solution

The fourth proportional to 864.15, 1,295.21 and 315.99 is: 473.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.15 : 1,295.21 = 315.99 : x
  2. Step 2: Convert to fraction form
    864.15/1,295.21 = 315.99/x
  3. Step 3: Cross multiply
    864.15x = 1,295.21 × 315.99
  4. Step 4: Simplify right side
    864.15x = 409,271.83
  5. Step 5: Solve for x
    x = 409,271.83/864.15
  6. Step 6: Final answer
    x = 473.61

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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.