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Finding the Fourth Proportional to 1,373.78, 1,895.64 and 784.28

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Solution

The fourth proportional to 1,373.78, 1,895.64 and 784.28 is: 1,082.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,373.78 : 1,895.64 = 784.28 : x
  2. Step 2: Convert to fraction form
    1,373.78/1,895.64 = 784.28/x
  3. Step 3: Cross multiply
    1,373.78x = 1,895.64 × 784.28
  4. Step 4: Simplify right side
    1,373.78x = 1,486,712.54
  5. Step 5: Solve for x
    x = 1,486,712.54/1,373.78
  6. Step 6: Final answer
    x = 1,082.21

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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.