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Finding the Fourth Proportional to 1,561.95, 2,155.70 and 898.78

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Solution

The fourth proportional to 1,561.95, 2,155.70 and 898.78 is: 1,240.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,561.95 : 2,155.70 = 898.78 : x
  2. Step 2: Convert to fraction form
    1,561.95/2,155.70 = 898.78/x
  3. Step 3: Cross multiply
    1,561.95x = 2,155.70 × 898.78
  4. Step 4: Simplify right side
    1,561.95x = 1,937,500.05
  5. Step 5: Solve for x
    x = 1,937,500.05/1,561.95
  6. Step 6: Final answer
    x = 1,240.44

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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.