Home / 1,210.55-1,815.78-430.52

Finding the Fourth Proportional to 1,210.55, 1,815.78 and 430.52

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Solution

The fourth proportional to 1,210.55, 1,815.78 and 430.52 is: 645.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.55 : 1,815.78 = 430.52 : x
  2. Step 2: Convert to fraction form
    1,210.55/1,815.78 = 430.52/x
  3. Step 3: Cross multiply
    1,210.55x = 1,815.78 × 430.52
  4. Step 4: Simplify right side
    1,210.55x = 781,729.61
  5. Step 5: Solve for x
    x = 781,729.61/1,210.55
  6. Step 6: Final answer
    x = 645.76

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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.