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Finding the Fourth Proportional to 976.55, 1,346.90 and 898.16

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Solution

The fourth proportional to 976.55, 1,346.90 and 898.16 is: 1,238.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.55 : 1,346.90 = 898.16 : x
  2. Step 2: Convert to fraction form
    976.55/1,346.90 = 898.16/x
  3. Step 3: Cross multiply
    976.55x = 1,346.90 × 898.16
  4. Step 4: Simplify right side
    976.55x = 1,209,720.48
  5. Step 5: Solve for x
    x = 1,209,720.48/976.55
  6. Step 6: Final answer
    x = 1,238.78

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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.