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Finding the Fourth Proportional to 1,038.53, 1,431.83 and 860.84

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Solution

The fourth proportional to 1,038.53, 1,431.83 and 860.84 is: 1,186.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.53 : 1,431.83 = 860.84 : x
  2. Step 2: Convert to fraction form
    1,038.53/1,431.83 = 860.84/x
  3. Step 3: Cross multiply
    1,038.53x = 1,431.83 × 860.84
  4. Step 4: Simplify right side
    1,038.53x = 1,232,572.23
  5. Step 5: Solve for x
    x = 1,232,572.23/1,038.53
  6. Step 6: Final answer
    x = 1,186.84

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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.