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Finding the Fourth Proportional to 1,438.65, 1,985.42 and 841.16

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Solution

The fourth proportional to 1,438.65, 1,985.42 and 841.16 is: 1,160.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.65 : 1,985.42 = 841.16 : x
  2. Step 2: Convert to fraction form
    1,438.65/1,985.42 = 841.16/x
  3. Step 3: Cross multiply
    1,438.65x = 1,985.42 × 841.16
  4. Step 4: Simplify right side
    1,438.65x = 1,670,058.55
  5. Step 5: Solve for x
    x = 1,670,058.55/1,438.65
  6. Step 6: Final answer
    x = 1,160.85

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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.