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Finding the Fourth Proportional to 976.79, 1,347.39 and 662.01

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Solution

The fourth proportional to 976.79, 1,347.39 and 662.01 is: 913.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.79 : 1,347.39 = 662.01 : x
  2. Step 2: Convert to fraction form
    976.79/1,347.39 = 662.01/x
  3. Step 3: Cross multiply
    976.79x = 1,347.39 × 662.01
  4. Step 4: Simplify right side
    976.79x = 891,985.65
  5. Step 5: Solve for x
    x = 891,985.65/976.79
  6. Step 6: Final answer
    x = 913.19

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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.