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Finding the Fourth Proportional to 985.19, 1,477.85 and 291.91

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Solution

The fourth proportional to 985.19, 1,477.85 and 291.91 is: 437.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.19 : 1,477.85 = 291.91 : x
  2. Step 2: Convert to fraction form
    985.19/1,477.85 = 291.91/x
  3. Step 3: Cross multiply
    985.19x = 1,477.85 × 291.91
  4. Step 4: Simplify right side
    985.19x = 431,399.19
  5. Step 5: Solve for x
    x = 431,399.19/985.19
  6. Step 6: Final answer
    x = 437.88

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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.