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Finding the Fourth Proportional to 912.57, 1,259.45 and 618.54

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Solution

The fourth proportional to 912.57, 1,259.45 and 618.54 is: 853.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.57 : 1,259.45 = 618.54 : x
  2. Step 2: Convert to fraction form
    912.57/1,259.45 = 618.54/x
  3. Step 3: Cross multiply
    912.57x = 1,259.45 × 618.54
  4. Step 4: Simplify right side
    912.57x = 779,020.20
  5. Step 5: Solve for x
    x = 779,020.20/912.57
  6. Step 6: Final answer
    x = 853.66

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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.