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Finding the Fourth Proportional to 876.40, 1,209 and 746.80

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Solution

The fourth proportional to 876.40, 1,209 and 746.80 is: 1,030.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.40 : 1,209 = 746.80 : x
  2. Step 2: Convert to fraction form
    876.40/1,209 = 746.80/x
  3. Step 3: Cross multiply
    876.40x = 1,209 × 746.80
  4. Step 4: Simplify right side
    876.40x = 902,881.20
  5. Step 5: Solve for x
    x = 902,881.20/876.40
  6. Step 6: Final answer
    x = 1,030.22

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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.