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Finding the Fourth Proportional to 810.95, 1,119.20 and 479.66

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Solution

The fourth proportional to 810.95, 1,119.20 and 479.66 is: 661.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.95 : 1,119.20 = 479.66 : x
  2. Step 2: Convert to fraction form
    810.95/1,119.20 = 479.66/x
  3. Step 3: Cross multiply
    810.95x = 1,119.20 × 479.66
  4. Step 4: Simplify right side
    810.95x = 536,831.08
  5. Step 5: Solve for x
    x = 536,831.08/810.95
  6. Step 6: Final answer
    x = 661.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.