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Finding the Fourth Proportional to 315.86, 473.75 and 84.77

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Solution

The fourth proportional to 315.86, 473.75 and 84.77 is: 127.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.86 : 473.75 = 84.77 : x
  2. Step 2: Convert to fraction form
    315.86/473.75 = 84.77/x
  3. Step 3: Cross multiply
    315.86x = 473.75 × 84.77
  4. Step 4: Simplify right side
    315.86x = 40,156.99
  5. Step 5: Solve for x
    x = 40,156.99/315.86
  6. Step 6: Final answer
    x = 127.14

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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.