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Finding the Fourth Proportional to 979.83, 1,353.51 and 886.68

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Solution

The fourth proportional to 979.83, 1,353.51 and 886.68 is: 1,224.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.83 : 1,353.51 = 886.68 : x
  2. Step 2: Convert to fraction form
    979.83/1,353.51 = 886.68/x
  3. Step 3: Cross multiply
    979.83x = 1,353.51 × 886.68
  4. Step 4: Simplify right side
    979.83x = 1,200,130.25
  5. Step 5: Solve for x
    x = 1,200,130.25/979.83
  6. Step 6: Final answer
    x = 1,224.84

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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.