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Finding the Fourth Proportional to 745.04, 1,028.28 and 686.48

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Solution

The fourth proportional to 745.04, 1,028.28 and 686.48 is: 947.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.04 : 1,028.28 = 686.48 : x
  2. Step 2: Convert to fraction form
    745.04/1,028.28 = 686.48/x
  3. Step 3: Cross multiply
    745.04x = 1,028.28 × 686.48
  4. Step 4: Simplify right side
    745.04x = 705,893.65
  5. Step 5: Solve for x
    x = 705,893.65/745.04
  6. Step 6: Final answer
    x = 947.46

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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.