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Finding the Fourth Proportional to 1,380.90, 1,905.47 and 933.74

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Solution

The fourth proportional to 1,380.90, 1,905.47 and 933.74 is: 1,288.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.90 : 1,905.47 = 933.74 : x
  2. Step 2: Convert to fraction form
    1,380.90/1,905.47 = 933.74/x
  3. Step 3: Cross multiply
    1,380.90x = 1,905.47 × 933.74
  4. Step 4: Simplify right side
    1,380.90x = 1,779,220.73
  5. Step 5: Solve for x
    x = 1,779,220.73/1,380.90
  6. Step 6: Final answer
    x = 1,288.45

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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.