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Finding the Fourth Proportional to 690.55, 952.86 and 428.47

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Solution

The fourth proportional to 690.55, 952.86 and 428.47 is: 591.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.55 : 952.86 = 428.47 : x
  2. Step 2: Convert to fraction form
    690.55/952.86 = 428.47/x
  3. Step 3: Cross multiply
    690.55x = 952.86 × 428.47
  4. Step 4: Simplify right side
    690.55x = 408,271.92
  5. Step 5: Solve for x
    x = 408,271.92/690.55
  6. Step 6: Final answer
    x = 591.23

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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.