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Finding the Fourth Proportional to 1,114.90, 1,538.95 and 642.99

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Solution

The fourth proportional to 1,114.90, 1,538.95 and 642.99 is: 887.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,114.90 : 1,538.95 = 642.99 : x
  2. Step 2: Convert to fraction form
    1,114.90/1,538.95 = 642.99/x
  3. Step 3: Cross multiply
    1,114.90x = 1,538.95 × 642.99
  4. Step 4: Simplify right side
    1,114.90x = 989,518.55
  5. Step 5: Solve for x
    x = 989,518.55/1,114.90
  6. Step 6: Final answer
    x = 887.54

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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.