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Finding the Fourth Proportional to 877.46, 1,210.88 and 479.12

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Solution

The fourth proportional to 877.46, 1,210.88 and 479.12 is: 661.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.46 : 1,210.88 = 479.12 : x
  2. Step 2: Convert to fraction form
    877.46/1,210.88 = 479.12/x
  3. Step 3: Cross multiply
    877.46x = 1,210.88 × 479.12
  4. Step 4: Simplify right side
    877.46x = 580,156.83
  5. Step 5: Solve for x
    x = 580,156.83/877.46
  6. Step 6: Final answer
    x = 661.18

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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.