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Finding the Fourth Proportional to 900.76, 1,242.92 and 551.36

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Solution

The fourth proportional to 900.76, 1,242.92 and 551.36 is: 760.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.76 : 1,242.92 = 551.36 : x
  2. Step 2: Convert to fraction form
    900.76/1,242.92 = 551.36/x
  3. Step 3: Cross multiply
    900.76x = 1,242.92 × 551.36
  4. Step 4: Simplify right side
    900.76x = 685,296.37
  5. Step 5: Solve for x
    x = 685,296.37/900.76
  6. Step 6: Final answer
    x = 760.80

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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.