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Finding the Fourth Proportional to 1,247.51, 1,721.61 and 688.02

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Solution

The fourth proportional to 1,247.51, 1,721.61 and 688.02 is: 949.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.51 : 1,721.61 = 688.02 : x
  2. Step 2: Convert to fraction form
    1,247.51/1,721.61 = 688.02/x
  3. Step 3: Cross multiply
    1,247.51x = 1,721.61 × 688.02
  4. Step 4: Simplify right side
    1,247.51x = 1,184,502.11
  5. Step 5: Solve for x
    x = 1,184,502.11/1,247.51
  6. Step 6: Final answer
    x = 949.50

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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.