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Finding the Fourth Proportional to 985.08, 1,477.58 and 291.78

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Solution

The fourth proportional to 985.08, 1,477.58 and 291.78 is: 437.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.08 : 1,477.58 = 291.78 : x
  2. Step 2: Convert to fraction form
    985.08/1,477.58 = 291.78/x
  3. Step 3: Cross multiply
    985.08x = 1,477.58 × 291.78
  4. Step 4: Simplify right side
    985.08x = 431,128.29
  5. Step 5: Solve for x
    x = 431,128.29/985.08
  6. Step 6: Final answer
    x = 437.66

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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.