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Finding the Fourth Proportional to 1,561.68, 2,155.55 and 898.74

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Solution

The fourth proportional to 1,561.68, 2,155.55 and 898.74 is: 1,240.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,561.68 : 2,155.55 = 898.74 : x
  2. Step 2: Convert to fraction form
    1,561.68/2,155.55 = 898.74/x
  3. Step 3: Cross multiply
    1,561.68x = 2,155.55 × 898.74
  4. Step 4: Simplify right side
    1,561.68x = 1,937,274.51
  5. Step 5: Solve for x
    x = 1,937,274.51/1,561.68
  6. Step 6: Final answer
    x = 1,240.51

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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.