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Finding the Fourth Proportional to 913.54, 1,259.19 and 618.28

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Solution

The fourth proportional to 913.54, 1,259.19 and 618.28 is: 852.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.54 : 1,259.19 = 618.28 : x
  2. Step 2: Convert to fraction form
    913.54/1,259.19 = 618.28/x
  3. Step 3: Cross multiply
    913.54x = 1,259.19 × 618.28
  4. Step 4: Simplify right side
    913.54x = 778,531.99
  5. Step 5: Solve for x
    x = 778,531.99/913.54
  6. Step 6: Final answer
    x = 852.21

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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.