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Finding the Fourth Proportional to 1,210, 1,670.01 and 686.34

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Solution

The fourth proportional to 1,210, 1,670.01 and 686.34 is: 947.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210 : 1,670.01 = 686.34 : x
  2. Step 2: Convert to fraction form
    1,210/1,670.01 = 686.34/x
  3. Step 3: Cross multiply
    1,210x = 1,670.01 × 686.34
  4. Step 4: Simplify right side
    1,210x = 1,146,182.88
  5. Step 5: Solve for x
    x = 1,146,182.88/1,210
  6. Step 6: Final answer
    x = 947.26

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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.