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Finding the Fourth Proportional to 858.52, 1,185.55 and 690.49

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Solution

The fourth proportional to 858.52, 1,185.55 and 690.49 is: 953.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.52 : 1,185.55 = 690.49 : x
  2. Step 2: Convert to fraction form
    858.52/1,185.55 = 690.49/x
  3. Step 3: Cross multiply
    858.52x = 1,185.55 × 690.49
  4. Step 4: Simplify right side
    858.52x = 818,614.06
  5. Step 5: Solve for x
    x = 818,614.06/858.52
  6. Step 6: Final answer
    x = 953.52

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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.