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Finding the Fourth Proportional to 876.08, 1,208.72 and 711.38

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Solution

The fourth proportional to 876.08, 1,208.72 and 711.38 is: 981.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.08 : 1,208.72 = 711.38 : x
  2. Step 2: Convert to fraction form
    876.08/1,208.72 = 711.38/x
  3. Step 3: Cross multiply
    876.08x = 1,208.72 × 711.38
  4. Step 4: Simplify right side
    876.08x = 859,864.03
  5. Step 5: Solve for x
    x = 859,864.03/876.08
  6. Step 6: Final answer
    x = 981.49

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1.5x scale

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.