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Finding the Fourth Proportional to 1,041.92, 1,437.40 and 687.39

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Solution

The fourth proportional to 1,041.92, 1,437.40 and 687.39 is: 948.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,041.92 : 1,437.40 = 687.39 : x
  2. Step 2: Convert to fraction form
    1,041.92/1,437.40 = 687.39/x
  3. Step 3: Cross multiply
    1,041.92x = 1,437.40 × 687.39
  4. Step 4: Simplify right side
    1,041.92x = 988,055.25
  5. Step 5: Solve for x
    x = 988,055.25/1,041.92
  6. Step 6: Final answer
    x = 948.30

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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.