Home / 1,639.02-2,453.64-987.78

Finding the Fourth Proportional to 1,639.02, 2,453.64 and 987.78

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Solution

The fourth proportional to 1,639.02, 2,453.64 and 987.78 is: 1,478.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,639.02 : 2,453.64 = 987.78 : x
  2. Step 2: Convert to fraction form
    1,639.02/2,453.64 = 987.78/x
  3. Step 3: Cross multiply
    1,639.02x = 2,453.64 × 987.78
  4. Step 4: Simplify right side
    1,639.02x = 2,423,656.52
  5. Step 5: Solve for x
    x = 2,423,656.52/1,639.02
  6. Step 6: Final answer
    x = 1,478.72

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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.