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Finding the Fourth Proportional to 1,380.48, 1,905 and 856.56

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Solution

The fourth proportional to 1,380.48, 1,905 and 856.56 is: 1,182.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.48 : 1,905 = 856.56 : x
  2. Step 2: Convert to fraction form
    1,380.48/1,905 = 856.56/x
  3. Step 3: Cross multiply
    1,380.48x = 1,905 × 856.56
  4. Step 4: Simplify right side
    1,380.48x = 1,631,746.80
  5. Step 5: Solve for x
    x = 1,631,746.80/1,380.48
  6. Step 6: Final answer
    x = 1,182.01

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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.