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Finding the Fourth Proportional to 900.19, 1,242.81 and 620.92

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Solution

The fourth proportional to 900.19, 1,242.81 and 620.92 is: 857.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.19 : 1,242.81 = 620.92 : x
  2. Step 2: Convert to fraction form
    900.19/1,242.81 = 620.92/x
  3. Step 3: Cross multiply
    900.19x = 1,242.81 × 620.92
  4. Step 4: Simplify right side
    900.19x = 771,685.59
  5. Step 5: Solve for x
    x = 771,685.59/900.19
  6. Step 6: Final answer
    x = 857.25

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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.