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Finding the Fourth Proportional to 709.64, 976.56 and 678.32

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Solution

The fourth proportional to 709.64, 976.56 and 678.32 is: 933.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.64 : 976.56 = 678.32 : x
  2. Step 2: Convert to fraction form
    709.64/976.56 = 678.32/x
  3. Step 3: Cross multiply
    709.64x = 976.56 × 678.32
  4. Step 4: Simplify right side
    709.64x = 662,420.18
  5. Step 5: Solve for x
    x = 662,420.18/709.64
  6. Step 6: Final answer
    x = 933.46

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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.