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Finding the Fourth Proportional to 1,114.16, 1,536.95 and 720.50

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Solution

The fourth proportional to 1,114.16, 1,536.95 and 720.50 is: 993.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,114.16 : 1,536.95 = 720.50 : x
  2. Step 2: Convert to fraction form
    1,114.16/1,536.95 = 720.50/x
  3. Step 3: Cross multiply
    1,114.16x = 1,536.95 × 720.50
  4. Step 4: Simplify right side
    1,114.16x = 1,107,368.87
  5. Step 5: Solve for x
    x = 1,107,368.87/1,114.16
  6. Step 6: Final answer
    x = 993.90

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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.