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Finding the Fourth Proportional to 867.70, 1,298.30 and 579.70

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Solution

The fourth proportional to 867.70, 1,298.30 and 579.70 is: 867.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    867.70 : 1,298.30 = 579.70 : x
  2. Step 2: Convert to fraction form
    867.70/1,298.30 = 579.70/x
  3. Step 3: Cross multiply
    867.70x = 1,298.30 × 579.70
  4. Step 4: Simplify right side
    867.70x = 752,624.51
  5. Step 5: Solve for x
    x = 752,624.51/867.70
  6. Step 6: Final answer
    x = 867.38

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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.