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Finding the Fourth Proportional to 763.36, 1,139.48 and 661.36

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Solution

The fourth proportional to 763.36, 1,139.48 and 661.36 is: 987.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.36 : 1,139.48 = 661.36 : x
  2. Step 2: Convert to fraction form
    763.36/1,139.48 = 661.36/x
  3. Step 3: Cross multiply
    763.36x = 1,139.48 × 661.36
  4. Step 4: Simplify right side
    763.36x = 753,606.49
  5. Step 5: Solve for x
    x = 753,606.49/763.36
  6. Step 6: Final answer
    x = 987.22

Related Problems

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Half scale
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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.