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Finding the Fourth Proportional to 1,210.87, 1,816.57 and 430.92

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Solution

The fourth proportional to 1,210.87, 1,816.57 and 430.92 is: 646.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.87 : 1,816.57 = 430.92 : x
  2. Step 2: Convert to fraction form
    1,210.87/1,816.57 = 430.92/x
  3. Step 3: Cross multiply
    1,210.87x = 1,816.57 × 430.92
  4. Step 4: Simplify right side
    1,210.87x = 782,796.34
  5. Step 5: Solve for x
    x = 782,796.34/1,210.87
  6. Step 6: Final answer
    x = 646.47

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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.