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Finding the Fourth Proportional to 1,438.92, 1,985.40 and 914.04

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Solution

The fourth proportional to 1,438.92, 1,985.40 and 914.04 is: 1,261.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.92 : 1,985.40 = 914.04 : x
  2. Step 2: Convert to fraction form
    1,438.92/1,985.40 = 914.04/x
  3. Step 3: Cross multiply
    1,438.92x = 1,985.40 × 914.04
  4. Step 4: Simplify right side
    1,438.92x = 1,814,735.02
  5. Step 5: Solve for x
    x = 1,814,735.02/1,438.92
  6. Step 6: Final answer
    x = 1,261.18

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1.5x scale

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.