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Finding the Fourth Proportional to 690.93, 953.45 and 395.98

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Solution

The fourth proportional to 690.93, 953.45 and 395.98 is: 546.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.93 : 953.45 = 395.98 : x
  2. Step 2: Convert to fraction form
    690.93/953.45 = 395.98/x
  3. Step 3: Cross multiply
    690.93x = 953.45 × 395.98
  4. Step 4: Simplify right side
    690.93x = 377,547.13
  5. Step 5: Solve for x
    x = 377,547.13/690.93
  6. Step 6: Final answer
    x = 546.43

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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.