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Finding the Fourth Proportional to 942.40, 1,300.39 and 522.75

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Solution

The fourth proportional to 942.40, 1,300.39 and 522.75 is: 721.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    942.40 : 1,300.39 = 522.75 : x
  2. Step 2: Convert to fraction form
    942.40/1,300.39 = 522.75/x
  3. Step 3: Cross multiply
    942.40x = 1,300.39 × 522.75
  4. Step 4: Simplify right side
    942.40x = 679,776.26
  5. Step 5: Solve for x
    x = 679,776.26/942.40
  6. Step 6: Final answer
    x = 721.33

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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.