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Finding the Fourth Proportional to 900.45, 1,242.18 and 551.34

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Solution

The fourth proportional to 900.45, 1,242.18 and 551.34 is: 760.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.45 : 1,242.18 = 551.34 : x
  2. Step 2: Convert to fraction form
    900.45/1,242.18 = 551.34/x
  3. Step 3: Cross multiply
    900.45x = 1,242.18 × 551.34
  4. Step 4: Simplify right side
    900.45x = 684,863.52
  5. Step 5: Solve for x
    x = 684,863.52/900.45
  6. Step 6: Final answer
    x = 760.58

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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.