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Finding the Fourth Proportional to 1,280.91, 1,921.82 and 632.10

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Solution

The fourth proportional to 1,280.91, 1,921.82 and 632.10 is: 948.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.91 : 1,921.82 = 632.10 : x
  2. Step 2: Convert to fraction form
    1,280.91/1,921.82 = 632.10/x
  3. Step 3: Cross multiply
    1,280.91x = 1,921.82 × 632.10
  4. Step 4: Simplify right side
    1,280.91x = 1,214,779.26
  5. Step 5: Solve for x
    x = 1,214,779.26/1,280.91
  6. Step 6: Final answer
    x = 948.37

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1.5x scale

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.