Home / 1,124.12-1,686.65-430.85

Finding the Fourth Proportional to 1,124.12, 1,686.65 and 430.85

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Solution

The fourth proportional to 1,124.12, 1,686.65 and 430.85 is: 646.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,124.12 : 1,686.65 = 430.85 : x
  2. Step 2: Convert to fraction form
    1,124.12/1,686.65 = 430.85/x
  3. Step 3: Cross multiply
    1,124.12x = 1,686.65 × 430.85
  4. Step 4: Simplify right side
    1,124.12x = 726,682.57
  5. Step 5: Solve for x
    x = 726,682.57/1,124.12
  6. Step 6: Final answer
    x = 646.45

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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.