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Finding the Fourth Proportional to 1,385.80, 2,073.78 and 1,113.64

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Solution

The fourth proportional to 1,385.80, 2,073.78 and 1,113.64 is: 1,666.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385.80 : 2,073.78 = 1,113.64 : x
  2. Step 2: Convert to fraction form
    1,385.80/2,073.78 = 1,113.64/x
  3. Step 3: Cross multiply
    1,385.80x = 2,073.78 × 1,113.64
  4. Step 4: Simplify right side
    1,385.80x = 2,309,444.36
  5. Step 5: Solve for x
    x = 2,309,444.36/1,385.80
  6. Step 6: Final answer
    x = 1,666.51

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.