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Finding the Fourth Proportional to 691.95, 1,037.41 and 417.98

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Solution

The fourth proportional to 691.95, 1,037.41 and 417.98 is: 626.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.95 : 1,037.41 = 417.98 : x
  2. Step 2: Convert to fraction form
    691.95/1,037.41 = 417.98/x
  3. Step 3: Cross multiply
    691.95x = 1,037.41 × 417.98
  4. Step 4: Simplify right side
    691.95x = 433,616.63
  5. Step 5: Solve for x
    x = 433,616.63/691.95
  6. Step 6: Final answer
    x = 626.66

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.