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Finding the Fourth Proportional to 1,427.40, 2,140.02 and 561.24

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Solution

The fourth proportional to 1,427.40, 2,140.02 and 561.24 is: 841.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,427.40 : 2,140.02 = 561.24 : x
  2. Step 2: Convert to fraction form
    1,427.40/2,140.02 = 561.24/x
  3. Step 3: Cross multiply
    1,427.40x = 2,140.02 × 561.24
  4. Step 4: Simplify right side
    1,427.40x = 1,201,064.82
  5. Step 5: Solve for x
    x = 1,201,064.82/1,427.40
  6. Step 6: Final answer
    x = 841.44

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.