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Finding the Fourth Proportional to 1,223.48, 1,688.64 and 803.10

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Solution

The fourth proportional to 1,223.48, 1,688.64 and 803.10 is: 1,108.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,223.48 : 1,688.64 = 803.10 : x
  2. Step 2: Convert to fraction form
    1,223.48/1,688.64 = 803.10/x
  3. Step 3: Cross multiply
    1,223.48x = 1,688.64 × 803.10
  4. Step 4: Simplify right side
    1,223.48x = 1,356,146.78
  5. Step 5: Solve for x
    x = 1,356,146.78/1,223.48
  6. Step 6: Final answer
    x = 1,108.43

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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.