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Finding the Fourth Proportional to 1,129.04, 1,557.39 and 687.25

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Solution

The fourth proportional to 1,129.04, 1,557.39 and 687.25 is: 947.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.04 : 1,557.39 = 687.25 : x
  2. Step 2: Convert to fraction form
    1,129.04/1,557.39 = 687.25/x
  3. Step 3: Cross multiply
    1,129.04x = 1,557.39 × 687.25
  4. Step 4: Simplify right side
    1,129.04x = 1,070,316.28
  5. Step 5: Solve for x
    x = 1,070,316.28/1,129.04
  6. Step 6: Final answer
    x = 947.99

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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.