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Finding the Fourth Proportional to 900.36, 1,242.51 and 551.05

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Solution

The fourth proportional to 900.36, 1,242.51 and 551.05 is: 760.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.36 : 1,242.51 = 551.05 : x
  2. Step 2: Convert to fraction form
    900.36/1,242.51 = 551.05/x
  3. Step 3: Cross multiply
    900.36x = 1,242.51 × 551.05
  4. Step 4: Simplify right side
    900.36x = 684,680.65
  5. Step 5: Solve for x
    x = 684,680.65/900.36
  6. Step 6: Final answer
    x = 760.45

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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.