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Finding the Fourth Proportional to 1,078.30, 1,617.90 and 772.12

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Solution

The fourth proportional to 1,078.30, 1,617.90 and 772.12 is: 1,158.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.30 : 1,617.90 = 772.12 : x
  2. Step 2: Convert to fraction form
    1,078.30/1,617.90 = 772.12/x
  3. Step 3: Cross multiply
    1,078.30x = 1,617.90 × 772.12
  4. Step 4: Simplify right side
    1,078.30x = 1,249,212.95
  5. Step 5: Solve for x
    x = 1,249,212.95/1,078.30
  6. Step 6: Final answer
    x = 1,158.50

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Half scale
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Double scale
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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.