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Finding the Fourth Proportional to 1,128.30, 1,554.75 and 797.10

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Solution

The fourth proportional to 1,128.30, 1,554.75 and 797.10 is: 1,098.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.30 : 1,554.75 = 797.10 : x
  2. Step 2: Convert to fraction form
    1,128.30/1,554.75 = 797.10/x
  3. Step 3: Cross multiply
    1,128.30x = 1,554.75 × 797.10
  4. Step 4: Simplify right side
    1,128.30x = 1,239,291.23
  5. Step 5: Solve for x
    x = 1,239,291.23/1,128.30
  6. Step 6: Final answer
    x = 1,098.37

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Half scale
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Double scale
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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.