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Finding the Fourth Proportional to 1,687.74, 2,529.88 and 647.46

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Solution

The fourth proportional to 1,687.74, 2,529.88 and 647.46 is: 970.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,687.74 : 2,529.88 = 647.46 : x
  2. Step 2: Convert to fraction form
    1,687.74/2,529.88 = 647.46/x
  3. Step 3: Cross multiply
    1,687.74x = 2,529.88 × 647.46
  4. Step 4: Simplify right side
    1,687.74x = 1,637,996.10
  5. Step 5: Solve for x
    x = 1,637,996.10/1,687.74
  6. Step 6: Final answer
    x = 970.53

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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.