Home / 1,560.21-2,153.07-861.59

Finding the Fourth Proportional to 1,560.21, 2,153.07 and 861.59

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Solution

The fourth proportional to 1,560.21, 2,153.07 and 861.59 is: 1,188.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,560.21 : 2,153.07 = 861.59 : x
  2. Step 2: Convert to fraction form
    1,560.21/2,153.07 = 861.59/x
  3. Step 3: Cross multiply
    1,560.21x = 2,153.07 × 861.59
  4. Step 4: Simplify right side
    1,560.21x = 1,855,052.82
  5. Step 5: Solve for x
    x = 1,855,052.82/1,560.21
  6. Step 6: Final answer
    x = 1,188.98

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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.