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Finding the Fourth Proportional to 1,561.22, 2,154.55 and 898.07

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Solution

The fourth proportional to 1,561.22, 2,154.55 and 898.07 is: 1,239.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,561.22 : 2,154.55 = 898.07 : x
  2. Step 2: Convert to fraction form
    1,561.22/2,154.55 = 898.07/x
  3. Step 3: Cross multiply
    1,561.22x = 2,154.55 × 898.07
  4. Step 4: Simplify right side
    1,561.22x = 1,934,932.23
  5. Step 5: Solve for x
    x = 1,934,932.23/1,561.22
  6. Step 6: Final answer
    x = 1,239.37

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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.