Home / 1,078.20-1,487.10-913.32

Finding the Fourth Proportional to 1,078.20, 1,487.10 and 913.32

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Solution

The fourth proportional to 1,078.20, 1,487.10 and 913.32 is: 1,259.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.20 : 1,487.10 = 913.32 : x
  2. Step 2: Convert to fraction form
    1,078.20/1,487.10 = 913.32/x
  3. Step 3: Cross multiply
    1,078.20x = 1,487.10 × 913.32
  4. Step 4: Simplify right side
    1,078.20x = 1,358,198.17
  5. Step 5: Solve for x
    x = 1,358,198.17/1,078.20
  6. Step 6: Final answer
    x = 1,259.69

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.