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Finding the Fourth Proportional to 900.48, 1,242.72 and 551.20

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Solution

The fourth proportional to 900.48, 1,242.72 and 551.20 is: 760.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.48 : 1,242.72 = 551.20 : x
  2. Step 2: Convert to fraction form
    900.48/1,242.72 = 551.20/x
  3. Step 3: Cross multiply
    900.48x = 1,242.72 × 551.20
  4. Step 4: Simplify right side
    900.48x = 684,987.26
  5. Step 5: Solve for x
    x = 684,987.26/900.48
  6. Step 6: Final answer
    x = 760.69

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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.