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Finding the Fourth Proportional to 1,650.42, 2,277.50 and 987.64

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Solution

The fourth proportional to 1,650.42, 2,277.50 and 987.64 is: 1,362.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,650.42 : 2,277.50 = 987.64 : x
  2. Step 2: Convert to fraction form
    1,650.42/2,277.50 = 987.64/x
  3. Step 3: Cross multiply
    1,650.42x = 2,277.50 × 987.64
  4. Step 4: Simplify right side
    1,650.42x = 2,249,350.10
  5. Step 5: Solve for x
    x = 2,249,350.10/1,650.42
  6. Step 6: Final answer
    x = 1,362.90

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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.