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Finding the Fourth Proportional to 1,728.10, 2,384.34 and 981.88

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Solution

The fourth proportional to 1,728.10, 2,384.34 and 981.88 is: 1,354.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,728.10 : 2,384.34 = 981.88 : x
  2. Step 2: Convert to fraction form
    1,728.10/2,384.34 = 981.88/x
  3. Step 3: Cross multiply
    1,728.10x = 2,384.34 × 981.88
  4. Step 4: Simplify right side
    1,728.10x = 2,341,135.76
  5. Step 5: Solve for x
    x = 2,341,135.76/1,728.10
  6. Step 6: Final answer
    x = 1,354.75

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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.