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Finding the Fourth Proportional to 933.98, 1,288.95 and 618.69

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Solution

The fourth proportional to 933.98, 1,288.95 and 618.69 is: 853.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    933.98 : 1,288.95 = 618.69 : x
  2. Step 2: Convert to fraction form
    933.98/1,288.95 = 618.69/x
  3. Step 3: Cross multiply
    933.98x = 1,288.95 × 618.69
  4. Step 4: Simplify right side
    933.98x = 797,460.48
  5. Step 5: Solve for x
    x = 797,460.48/933.98
  6. Step 6: Final answer
    x = 853.83

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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.