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Finding the Fourth Proportional to 806.42, 1,113.50 and 619.63

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Solution

The fourth proportional to 806.42, 1,113.50 and 619.63 is: 855.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.42 : 1,113.50 = 619.63 : x
  2. Step 2: Convert to fraction form
    806.42/1,113.50 = 619.63/x
  3. Step 3: Cross multiply
    806.42x = 1,113.50 × 619.63
  4. Step 4: Simplify right side
    806.42x = 689,956.77
  5. Step 5: Solve for x
    x = 689,956.77/806.42
  6. Step 6: Final answer
    x = 855.58

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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.