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Finding the Fourth Proportional to 1,124.65, 1,549.53 and 839.84

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Solution

The fourth proportional to 1,124.65, 1,549.53 and 839.84 is: 1,157.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,124.65 : 1,549.53 = 839.84 : x
  2. Step 2: Convert to fraction form
    1,124.65/1,549.53 = 839.84/x
  3. Step 3: Cross multiply
    1,124.65x = 1,549.53 × 839.84
  4. Step 4: Simplify right side
    1,124.65x = 1,301,349.53
  5. Step 5: Solve for x
    x = 1,301,349.53/1,124.65
  6. Step 6: Final answer
    x = 1,157.11

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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.