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Finding the Fourth Proportional to 1,387, 1,913.28 and 914.41

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Solution

The fourth proportional to 1,387, 1,913.28 and 914.41 is: 1,261.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387 : 1,913.28 = 914.41 : x
  2. Step 2: Convert to fraction form
    1,387/1,913.28 = 914.41/x
  3. Step 3: Cross multiply
    1,387x = 1,913.28 × 914.41
  4. Step 4: Simplify right side
    1,387x = 1,749,522.36
  5. Step 5: Solve for x
    x = 1,749,522.36/1,387
  6. Step 6: Final answer
    x = 1,261.37

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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.