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Finding the Fourth Proportional to 691.98, 954.90 and 412.40

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Solution

The fourth proportional to 691.98, 954.90 and 412.40 is: 569.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.98 : 954.90 = 412.40 : x
  2. Step 2: Convert to fraction form
    691.98/954.90 = 412.40/x
  3. Step 3: Cross multiply
    691.98x = 954.90 × 412.40
  4. Step 4: Simplify right side
    691.98x = 393,800.76
  5. Step 5: Solve for x
    x = 393,800.76/691.98
  6. Step 6: Final answer
    x = 569.09

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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.