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Finding the Fourth Proportional to 1,389.67, 1,917.75 and 760.20

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Solution

The fourth proportional to 1,389.67, 1,917.75 and 760.20 is: 1,049.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.67 : 1,917.75 = 760.20 : x
  2. Step 2: Convert to fraction form
    1,389.67/1,917.75 = 760.20/x
  3. Step 3: Cross multiply
    1,389.67x = 1,917.75 × 760.20
  4. Step 4: Simplify right side
    1,389.67x = 1,457,873.55
  5. Step 5: Solve for x
    x = 1,457,873.55/1,389.67
  6. Step 6: Final answer
    x = 1,049.08

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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.