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Finding the Fourth Proportional to 691.07, 953.64 and 442.40

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Solution

The fourth proportional to 691.07, 953.64 and 442.40 is: 610.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.07 : 953.64 = 442.40 : x
  2. Step 2: Convert to fraction form
    691.07/953.64 = 442.40/x
  3. Step 3: Cross multiply
    691.07x = 953.64 × 442.40
  4. Step 4: Simplify right side
    691.07x = 421,885.57
  5. Step 5: Solve for x
    x = 421,885.57/691.07
  6. Step 6: Final answer
    x = 610.49

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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.