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Finding the Fourth Proportional to 1,392.65, 1,921.55 and 803.06

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Solution

The fourth proportional to 1,392.65, 1,921.55 and 803.06 is: 1,108.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.65 : 1,921.55 = 803.06 : x
  2. Step 2: Convert to fraction form
    1,392.65/1,921.55 = 803.06/x
  3. Step 3: Cross multiply
    1,392.65x = 1,921.55 × 803.06
  4. Step 4: Simplify right side
    1,392.65x = 1,543,119.94
  5. Step 5: Solve for x
    x = 1,543,119.94/1,392.65
  6. Step 6: Final answer
    x = 1,108.05

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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.