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Finding the Fourth Proportional to 1,187.50, 1,638.73 and 690.14

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Solution

The fourth proportional to 1,187.50, 1,638.73 and 690.14 is: 952.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.50 : 1,638.73 = 690.14 : x
  2. Step 2: Convert to fraction form
    1,187.50/1,638.73 = 690.14/x
  3. Step 3: Cross multiply
    1,187.50x = 1,638.73 × 690.14
  4. Step 4: Simplify right side
    1,187.50x = 1,130,953.12
  5. Step 5: Solve for x
    x = 1,130,953.12/1,187.50
  6. Step 6: Final answer
    x = 952.38

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1.5x scale

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.