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Finding the Fourth Proportional to 913.51, 1,260.80 and 747.39

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Solution

The fourth proportional to 913.51, 1,260.80 and 747.39 is: 1,031.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.51 : 1,260.80 = 747.39 : x
  2. Step 2: Convert to fraction form
    913.51/1,260.80 = 747.39/x
  3. Step 3: Cross multiply
    913.51x = 1,260.80 × 747.39
  4. Step 4: Simplify right side
    913.51x = 942,309.31
  5. Step 5: Solve for x
    x = 942,309.31/913.51
  6. Step 6: Final answer
    x = 1,031.53

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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.