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Finding the Fourth Proportional to 1,186.50, 1,637.35 and 689.14

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Solution

The fourth proportional to 1,186.50, 1,637.35 and 689.14 is: 951.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,186.50 : 1,637.35 = 689.14 : x
  2. Step 2: Convert to fraction form
    1,186.50/1,637.35 = 689.14/x
  3. Step 3: Cross multiply
    1,186.50x = 1,637.35 × 689.14
  4. Step 4: Simplify right side
    1,186.50x = 1,128,363.70
  5. Step 5: Solve for x
    x = 1,128,363.70/1,186.50
  6. Step 6: Final answer
    x = 951.00

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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.