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Finding the Fourth Proportional to 985.91, 1,478.75 and 619.58

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Solution

The fourth proportional to 985.91, 1,478.75 and 619.58 is: 929.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.91 : 1,478.75 = 619.58 : x
  2. Step 2: Convert to fraction form
    985.91/1,478.75 = 619.58/x
  3. Step 3: Cross multiply
    985.91x = 1,478.75 × 619.58
  4. Step 4: Simplify right side
    985.91x = 916,193.43
  5. Step 5: Solve for x
    x = 916,193.43/985.91
  6. Step 6: Final answer
    x = 929.29

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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.