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Finding the Fourth Proportional to 1,041.28, 1,561.46 and 347.76

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Solution

The fourth proportional to 1,041.28, 1,561.46 and 347.76 is: 521.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,041.28 : 1,561.46 = 347.76 : x
  2. Step 2: Convert to fraction form
    1,041.28/1,561.46 = 347.76/x
  3. Step 3: Cross multiply
    1,041.28x = 1,561.46 × 347.76
  4. Step 4: Simplify right side
    1,041.28x = 543,013.33
  5. Step 5: Solve for x
    x = 543,013.33/1,041.28
  6. Step 6: Final answer
    x = 521.49

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Double scale
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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.