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Finding the Fourth Proportional to 1,129.84, 1,558.92 and 687.92

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Solution

The fourth proportional to 1,129.84, 1,558.92 and 687.92 is: 949.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.84 : 1,558.92 = 687.92 : x
  2. Step 2: Convert to fraction form
    1,129.84/1,558.92 = 687.92/x
  3. Step 3: Cross multiply
    1,129.84x = 1,558.92 × 687.92
  4. Step 4: Simplify right side
    1,129.84x = 1,072,412.25
  5. Step 5: Solve for x
    x = 1,072,412.25/1,129.84
  6. Step 6: Final answer
    x = 949.17

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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.