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Finding the Fourth Proportional to 912.21, 1,259.38 and 580.92

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Solution

The fourth proportional to 912.21, 1,259.38 and 580.92 is: 802.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.21 : 1,259.38 = 580.92 : x
  2. Step 2: Convert to fraction form
    912.21/1,259.38 = 580.92/x
  3. Step 3: Cross multiply
    912.21x = 1,259.38 × 580.92
  4. Step 4: Simplify right side
    912.21x = 731,599.03
  5. Step 5: Solve for x
    x = 731,599.03/912.21
  6. Step 6: Final answer
    x = 802.01

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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.