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Finding the Fourth Proportional to 976.09, 1,345.98 and 644.10

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Solution

The fourth proportional to 976.09, 1,345.98 and 644.10 is: 888.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.09 : 1,345.98 = 644.10 : x
  2. Step 2: Convert to fraction form
    976.09/1,345.98 = 644.10/x
  3. Step 3: Cross multiply
    976.09x = 1,345.98 × 644.10
  4. Step 4: Simplify right side
    976.09x = 866,945.72
  5. Step 5: Solve for x
    x = 866,945.72/976.09
  6. Step 6: Final answer
    x = 888.18

Related Problems

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Double scale
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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.