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Finding the Fourth Proportional to 1,210.43, 1,670.42 and 686.46

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Solution

The fourth proportional to 1,210.43, 1,670.42 and 686.46 is: 947.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.43 : 1,670.42 = 686.46 : x
  2. Step 2: Convert to fraction form
    1,210.43/1,670.42 = 686.46/x
  3. Step 3: Cross multiply
    1,210.43x = 1,670.42 × 686.46
  4. Step 4: Simplify right side
    1,210.43x = 1,146,676.51
  5. Step 5: Solve for x
    x = 1,146,676.51/1,210.43
  6. Step 6: Final answer
    x = 947.33

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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.