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Finding the Fourth Proportional to 1,686.54, 2,529.99 and 647.42

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Solution

The fourth proportional to 1,686.54, 2,529.99 and 647.42 is: 971.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,686.54 : 2,529.99 = 647.42 : x
  2. Step 2: Convert to fraction form
    1,686.54/2,529.99 = 647.42/x
  3. Step 3: Cross multiply
    1,686.54x = 2,529.99 × 647.42
  4. Step 4: Simplify right side
    1,686.54x = 1,637,972.45
  5. Step 5: Solve for x
    x = 1,637,972.45/1,686.54
  6. Step 6: Final answer
    x = 971.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.