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Finding the Fourth Proportional to 7,090.40, 9,784.32 and 3,946.40

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Solution

The fourth proportional to 7,090.40, 9,784.32 and 3,946.40 is: 5,445.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,090.40 : 9,784.32 = 3,946.40 : x
  2. Step 2: Convert to fraction form
    7,090.40/9,784.32 = 3,946.40/x
  3. Step 3: Cross multiply
    7,090.40x = 9,784.32 × 3,946.40
  4. Step 4: Simplify right side
    7,090.40x = 38,612,840.45
  5. Step 5: Solve for x
    x = 38,612,840.45/7,090.40
  6. Step 6: Final answer
    x = 5,445.79

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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.