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Finding the Fourth Proportional to 877.49, 1,210.92 and 479.14

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Solution

The fourth proportional to 877.49, 1,210.92 and 479.14 is: 661.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.49 : 1,210.92 = 479.14 : x
  2. Step 2: Convert to fraction form
    877.49/1,210.92 = 479.14/x
  3. Step 3: Cross multiply
    877.49x = 1,210.92 × 479.14
  4. Step 4: Simplify right side
    877.49x = 580,197.18
  5. Step 5: Solve for x
    x = 580,197.18/877.49
  6. Step 6: Final answer
    x = 661.20

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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.