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Finding the Fourth Proportional to 1,210.03, 1,812.69 and 688.45

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Solution

The fourth proportional to 1,210.03, 1,812.69 and 688.45 is: 1,031.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.03 : 1,812.69 = 688.45 : x
  2. Step 2: Convert to fraction form
    1,210.03/1,812.69 = 688.45/x
  3. Step 3: Cross multiply
    1,210.03x = 1,812.69 × 688.45
  4. Step 4: Simplify right side
    1,210.03x = 1,247,946.43
  5. Step 5: Solve for x
    x = 1,247,946.43/1,210.03
  6. Step 6: Final answer
    x = 1,031.34

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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.