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Finding the Fourth Proportional to 912.90, 1,260.18 and 651.27

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Solution

The fourth proportional to 912.90, 1,260.18 and 651.27 is: 899.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.90 : 1,260.18 = 651.27 : x
  2. Step 2: Convert to fraction form
    912.90/1,260.18 = 651.27/x
  3. Step 3: Cross multiply
    912.90x = 1,260.18 × 651.27
  4. Step 4: Simplify right side
    912.90x = 820,717.43
  5. Step 5: Solve for x
    x = 820,717.43/912.90
  6. Step 6: Final answer
    x = 899.02

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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.