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Finding the Fourth Proportional to 1,072.71, 1,480.55 and 630.99

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Solution

The fourth proportional to 1,072.71, 1,480.55 and 630.99 is: 870.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,072.71 : 1,480.55 = 630.99 : x
  2. Step 2: Convert to fraction form
    1,072.71/1,480.55 = 630.99/x
  3. Step 3: Cross multiply
    1,072.71x = 1,480.55 × 630.99
  4. Step 4: Simplify right side
    1,072.71x = 934,209.09
  5. Step 5: Solve for x
    x = 934,209.09/1,072.71
  6. Step 6: Final answer
    x = 870.89

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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.