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Finding the Fourth Proportional to 1,224.36, 1,688.76 and 830.70

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Solution

The fourth proportional to 1,224.36, 1,688.76 and 830.70 is: 1,145.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,224.36 : 1,688.76 = 830.70 : x
  2. Step 2: Convert to fraction form
    1,224.36/1,688.76 = 830.70/x
  3. Step 3: Cross multiply
    1,224.36x = 1,688.76 × 830.70
  4. Step 4: Simplify right side
    1,224.36x = 1,402,852.93
  5. Step 5: Solve for x
    x = 1,402,852.93/1,224.36
  6. Step 6: Final answer
    x = 1,145.78

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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.