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Finding the Fourth Proportional to 940.08, 1,411.74 and 651.72

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Solution

The fourth proportional to 940.08, 1,411.74 and 651.72 is: 978.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.08 : 1,411.74 = 651.72 : x
  2. Step 2: Convert to fraction form
    940.08/1,411.74 = 651.72/x
  3. Step 3: Cross multiply
    940.08x = 1,411.74 × 651.72
  4. Step 4: Simplify right side
    940.08x = 920,059.19
  5. Step 5: Solve for x
    x = 920,059.19/940.08
  6. Step 6: Final answer
    x = 978.70

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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.