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Finding the Fourth Proportional to 1,035.56, 1,561.06 and 947.98

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Solution

The fourth proportional to 1,035.56, 1,561.06 and 947.98 is: 1,429.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,035.56 : 1,561.06 = 947.98 : x
  2. Step 2: Convert to fraction form
    1,035.56/1,561.06 = 947.98/x
  3. Step 3: Cross multiply
    1,035.56x = 1,561.06 × 947.98
  4. Step 4: Simplify right side
    1,035.56x = 1,479,853.66
  5. Step 5: Solve for x
    x = 1,479,853.66/1,035.56
  6. Step 6: Final answer
    x = 1,429.04

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.