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Finding the Fourth Proportional to 1,438.42, 2,158.44 and 560.81

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Solution

The fourth proportional to 1,438.42, 2,158.44 and 560.81 is: 841.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.42 : 2,158.44 = 560.81 : x
  2. Step 2: Convert to fraction form
    1,438.42/2,158.44 = 560.81/x
  3. Step 3: Cross multiply
    1,438.42x = 2,158.44 × 560.81
  4. Step 4: Simplify right side
    1,438.42x = 1,210,463.94
  5. Step 5: Solve for x
    x = 1,210,463.94/1,438.42
  6. Step 6: Final answer
    x = 841.52

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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.