Home / 1,087.60-1,632.02-438.40

Finding the Fourth Proportional to 1,087.60, 1,632.02 and 438.40

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Solution

The fourth proportional to 1,087.60, 1,632.02 and 438.40 is: 657.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,087.60 : 1,632.02 = 438.40 : x
  2. Step 2: Convert to fraction form
    1,087.60/1,632.02 = 438.40/x
  3. Step 3: Cross multiply
    1,087.60x = 1,632.02 × 438.40
  4. Step 4: Simplify right side
    1,087.60x = 715,477.57
  5. Step 5: Solve for x
    x = 715,477.57/1,087.60
  6. Step 6: Final answer
    x = 657.85

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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.