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Finding the Fourth Proportional to 978.64, 1,467.96 and 761.60

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Solution

The fourth proportional to 978.64, 1,467.96 and 761.60 is: 1,142.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.64 : 1,467.96 = 761.60 : x
  2. Step 2: Convert to fraction form
    978.64/1,467.96 = 761.60/x
  3. Step 3: Cross multiply
    978.64x = 1,467.96 × 761.60
  4. Step 4: Simplify right side
    978.64x = 1,117,998.34
  5. Step 5: Solve for x
    x = 1,117,998.34/978.64
  6. Step 6: Final answer
    x = 1,142.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.