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Finding the Fourth Proportional to 4,985.64, 7,477.90 and 1,287.72

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Solution

The fourth proportional to 4,985.64, 7,477.90 and 1,287.72 is: 1,931.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,985.64 : 7,477.90 = 1,287.72 : x
  2. Step 2: Convert to fraction form
    4,985.64/7,477.90 = 1,287.72/x
  3. Step 3: Cross multiply
    4,985.64x = 7,477.90 × 1,287.72
  4. Step 4: Simplify right side
    4,985.64x = 9,629,441.39
  5. Step 5: Solve for x
    x = 9,629,441.39/4,985.64
  6. Step 6: Final answer
    x = 1,931.44

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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.