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Finding the Fourth Proportional to 1,127.70, 1,555.93 and 685.61

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Solution

The fourth proportional to 1,127.70, 1,555.93 and 685.61 is: 945.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.70 : 1,555.93 = 685.61 : x
  2. Step 2: Convert to fraction form
    1,127.70/1,555.93 = 685.61/x
  3. Step 3: Cross multiply
    1,127.70x = 1,555.93 × 685.61
  4. Step 4: Simplify right side
    1,127.70x = 1,066,761.17
  5. Step 5: Solve for x
    x = 1,066,761.17/1,127.70
  6. Step 6: Final answer
    x = 945.96

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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.